High compression 360 set-up

Rear Gear I’m not sure, to my knowledge it’s stock. I haven’t gotten to change anything behind the engine. So stock trans and rear end. Do want to put a 8 1/4 or 3/4 in in the future. Intake is a basic Jegs small block 4-barrel. And can I’m unsure as well the guy I bought from wasn’t sure what his father-in-law had done to it. I was surprised when I pulled the heads to replace the gasket to see domed pistons.
That wasn’t super helpful sorry.