Yeah, I was just thinking that if the compression is too high, all he'd really need done is a squish test and the combustion chamber opened up a little right? Or just use nitro methane!! Hee hee.
But yeah man, since your getting the pro design head, you can get one dome to use with that jug and another dome to use with your new one. You should get in touch with one of these builders. Send that stuff to them to mic out