Ok, use the ones similar to the first pic that you have in the shop right now.
Get the block "Zero Decked", tell your machinist and he'll know what to do.
Use pistons with two valve reliefs and any decent head gaskets that are 0.038-0.041" thick. That should give you enough compression for the cam and still use pump gas. Somewhere around 9.7-1 I'd guess.
Have fun with it dude.