once you put it together compression test it and that will tell you which octane you need to run.
You have a handful of good parts there. better start then i had for sure.
That Trinity setup isnt a bad setup its before trinity really became crappy. should have some good power IMO its just a old school build from before they made aftermarket cylinders etc.
The only thing to really check is that the crank is welded. otherwise it will be a pretty good piece. looks like mostly cosmetic issues which can be fixed over time.
trust me, if i knew of this site before i bought mine i wouldnt have bought it live and learn, i had a shee, got out of the game, and when i came back had to get one again. more fun to drive then most, especially once you get yourself set up.