MSA sells a kit. You really should search. But off the top of my head I believe there are some 3.1's and 3.2's running around that make about 320-340 hp. It isn't bad, but it is high strung at that point. If you want to make more I think turbo will need to be used. As far as cost the MSA big bore kit is $1,800 (i looked it up) and then your going to want a cam with springs and all that $200, triple webers or mukinis $1000-1500 unless you want to go EFI, and I don't know some clutch components and what not $500. Assuming you are going from stock to that. So basically it is in the $3,500 range. Then of course we multiply by 1.5 because thats how budgets work. You are looking at spending $5,250 all things concidered. Just a rough estimate, really rough, seeing as I am a 5.0L Z guy. Just giving you an idea.