340 Main caps question

So I grabbed a 1971 standard bore 340 block with no caps but pretty much for nothing. I plan on slowly doing my build very slowly so I figured I'd grab it knowing There will be more work down the line. I posted previously
I'd like to try to get 500hp with 11/1 compression , ported eddys etc. Anyway , would I be better off getting aftermarket hi quality main caps or just grab standard 340 caps if I can find them. I don't mind spending the extra money if it makes a big difference as far as durability. I plan on running a stock forged crank ( no stroker ). Thank you in advance. Any advice helps.