what would be some of the issues?

[ThomS]

Tom what would be the problems that might happen if the I M gasket was not installed? Loss of power ???????????

[Tom @ Fast Forward]

Thom,

You should be making 10-11PSI at max RPM. Put it in 3rd gear and run up the on ramp to the freeway. Check your boost gauge. If it makes 10PSI, that gasket is probably there or doesn't matter.