Hypothetically, what would happen...?

don't think that would work too well. remember back when mopar article about putting std bore 340 pistons in 360? i did that. when i assembled engine the pistons looked like hills and valleys. and the block had not been decked. measured each piston that was out of hole and had top milled to .005 below. couldn't keep head gaskets on the damn thing from blowing. that was like 100 years ago, it seems. nothing wrong with trying to save some money but .....