i am putting together a warmed over lo-med performance 2.55L stroker (2.5 crank/rods 040 over pistons, 93 2.3 block) now to head choice.My goal is 140hp from 155ci which seems doable but anyway I now have 3 (1986.1993&1998) heads to choose from.My hp goal is trumped by ease of swap so unless ALL the 1986 fi stuff will bolt onto one of the 8 plug heads and it will go in with NO problems otherwise I will use the 1986 with a 3 angle vale job and some planing to raise compression.