Wayne -- I'd adjust the pinion angle UP 2 or 3* and see if that helps with the shock mount issue. You'll ultimately need to set this when the motor etc and with the car fully weighted... but this would at least let you see if that is going to be something of a cure.
I would ASSume you're motor is going to be set with a 3* down angle... and that would have the pinion angle "nose high" approximately the opposite 2 to 3*
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