Small Block performance upgrade suggestions?

My engine compartment will only fit 2 small blocks. I presently have 2 newer 350 Magnum EFI Mulptiport engines.

Please suggest horsepower upgrades.

Thank you very much. RB

It depends on CUBIC DOLLARS ,how much do you want to spend ??
we can put blowers on it and thats the cheapest and fastest and we could stroke it to a 406 or 383 and have a good motor combo !
It really depends on the money and how fast you need to go ,,p,lease advise !!

WELCOME TO THE BOARD

Would $4,000 to 6,000 do anything?