You really didn't give us enough information for us to give you or best advice; like what do you plan to use this engine for? If it is strickly for racing why would you even consider less compression. Also the centerline of the camshaft is going to make it very difficult to degree it in when working with the 4.75 stroke; you would be much better off with 116* centerline. The heads and advice about them depend on what type of use, Nitrous or not, and etc. This is true for the whole engine combination.
What state are you from? We build engines if you want professional advice.
Good Luck.