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583 big bore

Hey guys I am putting my dads old race sled back together for him as a surprise. It's a 583 with fast twin pipes, he has told me the only Modification he had done was shave the head and run a thicker base gasket to make the pipes work better and jetting. i am going to run a 78 mm wiseco piston and have the raves cut down to match my question is how do I determine how much the head was shaved and what base gasket to run I can't see any markings on it
 
R
Nov 17, 2012
55
10
8
Rexburg Idaho
yes there is markings on the base gasket on the back side between the two cylinders there is a series of holes punched in it like 5 holes or 6 holes they are different thickness I know alot of them used 5 hole gaskets with milled heads
 
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