If you are running short on money I would get rid of the big cam and replace it with something like this. Summit Racing Street & Strip® Cam Kits SUM-K00042 - SummitRacing.com
. If you choose to mildly port the heads follow cobalt327 advice. Just swap your intake and carburetor to the 400 motor. Then install it in your El Camino and have some fun driving it.