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The cylinders should be the same overall height from bottom sealing surface to the top sealing surface. You need to measure the heights on all of them. When your heads arrive they will all be the same thickness. The stack up is very important, the cam towers need to mount to the heads, and the head top surface across the bank needs to be planar, otherwise the cam tower will distort and the camshafts will bind, not good.
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'77 1973 911RS Backdate, 2.7 liter w/webers
'70 911ST , 3.2 liter '82 '74 911 IROC Tribute , 3.0 in progress
'75 911 RSR street car in progress
'77 930 Replica '75 993 GT2 EVO race car , 3.6 TT
'79 928 5 speed money pit in progress
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