Shad,any engine pics, to see your setup,,
X2
Need pics.
Corteco, is supposed to make head gasket for our engines.
Contact them or Mike Kirby, if they are available.
Personally I do not like the overbore which the Felpro gasket has.
4.125" bore IIRC"
Need to add breathers to your valve cover to reduce the blow by.
I had the same problem,not as bad, when I was only running 8-9 psi of boost pressure.
The stock PCV & stock valve cover breather is not enough to relieve the excess crank case pressure.
An offy will be able to go to boost faster, better response,& better than a Clifford IMO. Stock manifold, restrictive because of adaptor 2 to 1 barrel.
The GN turbo,is probably really a bit on the small side ,but will work. There 3 bolt inlet is a bit restrictive @ higher larger boost levels.
Forged pistons, always a good choice when turbo or blower charging.
Will add more later.
MBHD