I've read it can be done in several different articles. My question is which intake do you use when you make the head swap? My 86 Cutlass Supreme has a 71' 350 in it. So 455 big block intake or small block intake when you do a big block set of heads on a small block olds.
If you use the cast iron 455 heads the Edelbrock Performer RPM #7111 has enough material to port match but being that your name is "Big&Rich$" why not just spring for the Edelbrock aluminum heads and save some weight and have a better flowing head.
Do you have the big block heads and if you do, what is the letter on the corner before #1 spark plug hole? What "number" are on the small block heads on the engine presently? Stay away of J big block heads. You may lose a little compression unless your your small block heads are#8's which are around 80ccs like BB heads.
Either Procomp or Edelbrock heads with 10 cc's removed and the #7111 intake. Your 71 350 has huge dish pistons and will need replaced. Your #7 heads are good heads to start with and unless 10 to 1 compression and a big cam is used, I would just open the bowls and add 2.07"/1.625" valves on the factory heads.
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