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There's so many things that you can do. The only important question is...What do you want the truck to be able to do?
Find yourself an old Versailles with a 302 & 4 wheel disc & a 9"LS.
That way, you can put a blower on it..............Oops, that's what I want.
Seriously, plan the entire package out to suit your needs, then go at it
Try starting with a Gibson exhaust with a high flow cat and a header.