I would still check deck height on whatever aftermarket block even after squaring up. When I swapped mine from a MR1 to an IA my pistons were 0.010 out and had to get a thicker head gasket.
Most aftermarket blocks even Chevy etc there is going to be some work involved. Casting flashing to remove(check cam tunnels) possibly coolant holes to drill. Mike cam bearing holes too.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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