are you also using a stall convertor and some rear gears too? that cam probably wants like 2200-2400 stall
are you sure you set the timing marks up correctly?
you will have to adjust and play with timing since it's an aftermarket cam
also make sure you have at least 9.5:1 compression with that cam, it can be used with lower, but prefers higher comp
that cam should have some chop/lope to it in a 400, which should vibrate the motor, but what you are describing sounds excessive
was the distributor set correctly?
verified firing order
and is the balancer in good shape?
all these little things can add up
i'd love to hear how that cam sounds with your setup
to check what heads you have, get the code from the center exhaust ports
probably something like 6x
just some ideas on top of what the others have said
never assume, go verify
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