He will have to build his engine to start with, with that lower compression as an objective. He isn't going to be able to have both high and low compression with the same pistons or by swapping heads. Since the 194 head is going to put him over the top, compression wise for his N/A engine, it really isn't an option for him to even consider that head at all. He will have to use some sort of dish pistons, and maybe cut the large chamber head by some amount to get back into the mid 9's with compression. It all depends on what size dish he can find available to start with, and do some number crunching to see if he can find a happy medium to use for both engines.
