Well- I'm not selling my of V8 cars, but my 68 Firebird is getting a turbo'd Voretch 4200. I'm looking at a finished weight of around 2750-2800 lbs, with the bigger wheels & tires. The car started out as a Sprint (OHC-6), so this just seemed to be the next step.

Why not, right?

How about a Northstar? All aluminum, small displacement, V8 torque, good looking....Definitely not a "run-of-the-mill" mill.

http://www.chrfab.com/

Remember that 400-plus reliable HP from 4 cylinders can get expensive and may require a steep learning curve.