You had better check your clearance between the cylinder head and the piston. I think you might have problems at the spark plug side of the chamber, also if the chambers are stock there is an eybrow shaped part of the casting around the intake valve that protrudes into the chamber that could hit. The final check of the clearance has always been to try and turn the engine over with no head gaskets in place, then if you use a ,040 gasket you will be in the ballpark. If your pistons are .030 down in the cylinder instead of .030 out you should be fine.