4 bolt main

I am restating an old project, which was a 6 cylinder '71 Nova that I picked up years ago. What I'm working with: 72' SB 350 Engine casting number 3970010 - 4 bolt main Heads casting number 3998991 - 1.72/1.5 Rebuilt turbo 350 transmission I am looking to make a nice street rod out of it...

i have a sb400 4 bolt main block and have alumn pro 1 dart heads (dont know the specs) they were sold to me for $200 so i had to buy them. but i want to make 600hp on pump gas, can anyone give me any advice on building the bottom end? i have about $2k to spend on the rotating assembly.

How much stronger is a 4 bolt main than a 2 bolt and how much HP can a 2 bolt 383 handle.