X2 to all of that, I'd listen to the man....................many have been down this same route and all who were firmly convinced 'it would work' then found it was not so lacking the specialty work to make it happen. When dealing with proper compression most look at the 'slight' difference in head and piston and shrug it off, what they miss is that the volume there is a function of the compression ratio, in short an 8 or 9X error bigger than you think because the top volume does not now match the bottom overall volume to be efficient. Even a slight difference there low and the engine won't pull a far girl off a tricycle. Or, too much even slightly and the engine pings to no end with the fuel now available.
For instance, on the DOHCs there is a combo that people tend to flock to because it's 'easy' that puts the available piston a measly .060" (1/16 inch) down lower in the hole, the engines built like that then run like crap. The people doing it think it'll run better because the piston has a higher dome, therefore it must add compression..........WRONG!