Bein an ole GMC,I'm thinkin about and Ole Jimmey 302 6 (built of course) that I've had layin around for about 30 years.
Ran it in a rail years ago, on alky, used to put out just about 425 H.P.
A real torque monster.
Let's see a nice turbo on it hooked to a 5/6 speed outta work out pretty good.
Ya never know.