1977 904 horsepower limits?

My guy does my transmissions for 600-800 dollars.

Uses bolt in sprag, alto red clutches. Machines drum for an extra clutch. Forget what band. Know it isn’t a Kevlar one. He doesn’t like them for my street use. . 3.8-4.2 kickdown leaver and his Home made shift kit.

I don’t bother with getting stock converters tweaked. I call dynamic and have one built for me. More expensive hell yea but the difference is incredible. And don’t even bother with the stock flexplate. Go get a sfi one with the larger bolts. Do it right do it once.