I am using iron heads with 8.5 : 1 CR .

need to know piston to bore clearance (forged).

ring gap.

best spark pluges.

planning to put it in a GMC sonoma 93.

no AC no power steering .

with three speed manual and 3.08 axle ratio.

relocating gas tank where the spare is ( using 91 caprice tank).

relocating battrey in the right rear .

will try to keep you posted so wish me luck.