[Unreal]

Rob, They had high compression heads (I'm guessing 11:1, but don't know for sure--had to run High test gas), Rochester 4 bbl. Mine had single exhaust. However, I remember I had a hard time finding a replacement exhaust pipe. I can't remember the details, but I found one that was listed for my car, but when the guy brought it out, it had a wye on it that was crimped and welded shut. I'll bet at least some of them were dual exhaust.
They also had heavy duty "GTO" suspension , and came standard with a 3 speed and Hurst shifter. mine had an open rear, but I don't know the ratio.
Stock Lemans badging with a 3 stripe (two 1/4" with a 2" in the middle) located about halfway up the sides between the wheelwells. The word "SPRINT" replaced the center of the stripe on part of the fender.

I think it was a 250 ci with 230 hp. Drum brakes all around.

When I first started looking for a car, there was a 69 Firebird Sprint 4 speed convt. that had some Lingenfelter work done to it. It was around Blacksburg Va, but I never went to look at it.