Hi Jon. So you allude to a T-5 conversion, in a rear wheel drive car. I did a T-5 conversion once with a Buick 6. It was a 1964 225" built-up Buick hooked to a T-5 in a Chevy Monza. The first gen Buick sixes had steel cranks and rods and were the strongest of the old odd-fire Buicks. Mine had 1979 tall-port Smokey Yunick stage 1 heads, a 650 CFM carb on a custom intake, and went like stink. It was the most fun car I've ever owned, and I wish I had it today. It smoked clutches, though. I used the standard flywheel and clutch out of a 1976 Buick Skyhawk, and it wasn't big enough (8" clutch if I recall correctly). If I had it today it would have a gen III supercharged motor in it. It's a good engine and blows away the older generation Buick sixes I used to play with.

Have fun with your project and good luck finding a car to stick it in.