Engine build advice

[Corbusa]

Hey Guys I'm not on the forums much - I work and sleep is about it ( and try to keep my health up) anyway, I am slowly restoring a truck , its a 1984 chevy short bed - Its taken a few years to get it to the point of the engine.. and I have been out of the engine building loop for about 15+ years - So I'm looking for advice.... My truck has a 12 bolt 3:40 gear ( posi ) , a 400 turbo trans, and I'm wanting to start gathering parts so I can someday get the engine put together.. here's my question - I want as much HP as possible on pump gas ( high octane is fine) , I have a 283 engine, a 350 4 bolt block, a 327 Large journal ( marine block) and a 400 Block ... I hear the vortex heads are the choice for the price ( I'd really like 400-500 HP..) , I've never built a roller motor - but I'd like to have a roller cam set-up .. I was thinking turbo - but I think I'll just keep is simple and I do want the AC to work ... which engine do you think is best .. and I like longevity ... 377- 383- 400 ???
I think my next item on the list for it is - the headers and exhaust - then the AC , a big radiator so when I'm ready for the engine swap all that stuff is done.. any advise is appreciated , Thanks