Need Physics help... Boost leak or no?

Ok, I've been having problems with my blower not seeing full boost. I have a 9# pulley on my KB kit but am only seeing 6#'s of boost at my gauge. I believe my stroker should reduce the amount I am seeing at the gauge due to the increased displacement but
I am not sure by how much. Do I still have a leak over and above the potential boost decrease of the 302 stroker motor. Any physics experts out there figure this one out? I know there are some variables but even a rough guess may help. I can't see it being possible to lose 3#'s of boost through a leak, the motor has to play a role somehow. I have increased the displacement by 21CI or 7%, but a 33% loss in boost seems high but is it plausible?

jstreet0204 said:

More displacement, blower cams, longtubes, high altitude, etc. These things are all going to lessen the boost you see. By the time you add them all up I don't think 3lbs is unusual, since that 9lb reference was made on a stock motor. I see about 2#'s difference just between summer and winter temps here in NC.

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That's what I wanted to know. I still think I have a manifold gasket problem but not so severe as to leak that much boost. Thanks!