They are just gearboxes. It’s not like an auto. I would trust anyone who does normal manual builds to rebuild one really.
That said, for extra power I talked to most of the big names at PRI a couple of years ago. And the general advice I got was to just buy an out of the box magnum if you want increased power capacity. Though to be fair I was looking at more like 700 ftlbs not 500.
There are lots of good options though if you want to go outside your area. Liberty gears. Tick performance, modern driveline to name a few.
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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