[Wild83C10]

twin 88mm are pretty large for a 454. You don't need SS headers, a good set of mild steel would work fine. An intercooler isn't required either, but it does help.

You can build a 1200 hp BBC with twins or single and it can be very streetable if you build the right combo.

In order to provide some advise we need to know what parts you want to keep, what you are willing to spend (cheap to someone else may not be cheap to you) and what your goals are. 9 sec time slips, 1000 rwhp??