The Rams had only four players in the scoring column, but all four reached double figures with Mark Dannenmueller's 21 leading the way.
Scott City (19-4) jumped out to a 7-2 lead in the contest before Willie Hassell's first of five treys pulled the 'Dogs to within two at 7-5.
The two teams traded buckets and the lead the rest of the period until Hassell's third 3-pointer gave the Bulldogs a lead of 17-14 to end the quarter.
Mark Johnston, who netted 15 points in the contest kept the Rams close with six points in the period.
Scott City's Tyler Ward began to deny the Bulldogs their inside game in the second quarter. The Rams scored 12 points and held P'ville to 10 in the period and trailed by only one at 27-26 at halftime.
"The big man (Tyler Ward) came out and stopped what we wanted to do with the ball. Their guards played well and beat our guards on dribble penetration. They got a nice team and Lance Amick did a good job of getting them ready to play,'' said Portageville coach Jim Bidewell.
"It was a different type of game and we're not used to it because the height of the 6-foot-9 kid, but we just didn't adjust as well as some of the other teams. Their point guard handled the ball well and we didn't do a very good job of keeping the ball out of his hands. This game just shows that we still have a lot to learn," continued Bidewell.
Neither team could gain an advantage in the third quarter. Scott City led throughout but not by much.
The Rams' biggest lead was 40-34 at the 2:15 mark, but a trey by Jordan Penn pulled the Bulldogs to within three at 40-37.
Portageville (19-5) battled back and knotted the score at 42 apiece on a Hassell free throw as the quarter ended.
"It was a total team effort tonight. The guys just played their hearts out. There were plenty of times when we could have gotten frustrated and got down, but we just kept plugging away, with heart and pride. They wanted to win tonight," said Rams coach Lance Amick.
"You can't say enough about a Portageville basketball team. They have Willie Hassell, one of the best players in the state in any class. And they have Jim Bidewell over there who doesn't have a player over 5-10, but gets as much or more out of players as anybody in the whole state. He's a legend. You can never count out a Jim Bidewell coached team," concluded Amick.
After falling behind in the early stages of the fourth quarter, successive buckets by Hassell gave the Bulldogs a 49-45 lead at the 6:08 mark, but Ward responded with a put-back at the 5:45 point.
The two teams battled furiously for the next four minutes.
With under a minute to play in regulation, Ryan Glastetter gave the Rams what appeared to be enough to close out the contest with a bucket. They led 59-55.
But Jimmy Larry's trey brought the Bulldogs to within one at 59-58 with just over 30 seconds left.
Then as Hassell drove the lane with under six seconds left, he was fouled and nailed the second attempt to tie the score at 59. A desperation shot by the Rams went wide and overtime was necessary.
Glastetter led off the overtime period with a bucket to give the Rams the lead and they never trailed again.
Hassell nailed all three attempts from the charity stripe with under eight seconds left to bring the Bulldogs to within one.
Portageville regained possession on the strangest play of the game.
The Rams worked the ball down the floor very quickly on a long pass, but when trying to ice the game with a bucket, the ball wedged between the rim and the backboard with 6.1 seconds remaining.
The possession arrow favored Portageville. Hassell drove the length of the floor but was double-teamed and couldn't get a look at the bucket before time expired.
Portageville's jayvee team defeated the junior Rams 63-54.
The Bulldogs will take on Kennett in Class 3, District 1 play on Monday night at 6:00 at New Madrid.