There is no replacement for displacement.....i would never install a 307,305, or a 327 into anything i could put a 350 into, and if you can put a 350 into it you can stuff a 454 into it....350's are still pretty easy to get a hold of nowadays.

check this out: http://cgi.ebay.com/ebaymotors/ws/eB...category=33613

Pretty good pricing too....