>>>*If the block was not decked then your spec is still fine in my opinion. .017" does have an effect, the cam is retarded a bit and this moves the power peak a bit higher in the RPM scale, not much.

My suggestion would be to leave it alone, use the stock head gasket thickness.

But if you determine you do need one, it's not a problem, we keep a half dozen of them around just in case....*EB

*Beats the he** outa me!....*LOL**...