The spacers I was referring to are typically used to raise the height of the VC so it could clear high lift valve gear. The look similar to the gasket in shape but are made out of a solid material. Mine are made out of aluminum. By RTVing the spacer to the VC, I eliminated the problem with the width of the VC, and also presented a nice smooth, solid surface to seal against the gasket (as opposed to the MP VC, which have all sorts of casting effects on the sealing surface). Spacers will likely run 60-80, but are cheaper than buying a nice set of high end VC (assuming you already have the MP VC). If I had it to do all over again, I would have looked further for better VC and accepted the cost.
I tried the RTV gasket to VC, grease between gasket and head, but that still leaked some. I think that approach would work fine if the VC were a little more narrow, to get a wider sealing area with the gasket.
When using the spacers you do need longer studs. I used 2" "set screws" from Fastenal. They were like $0.40 each.
Dave
That's what I found with my MP covers also. They have to be centered before tightening the bolts on some heads. You can feel the gasket off center if you feel under the top and then the bottom of the VC lip. 
