whats a good head iv saw so many im leaning to the edelbrock 165cc intake port 60cc combust 202 in 1.6 ext only because it about the only one i see for 87 up with center bolt valve covers and odd center intake bolts.im going to use a fairly big cam like probly 550 to 590 lift cam whats the diff in the 165 cc intake ports and the 200 or so that iv saw