For the black plugs, check that the choke is opening fully and the air filter isn't clogged. Bog on throttle opening is usually caused by too little fuel rather than too much. Check that the accelerator pump is working.
Besides the other maintenance items you mentioned, a 72 would still have distributor points if it was stock, so replace them if they look bad and check the dwell and timing. Don't forget to put a TINY amount of grease on the distributor cam. You might also want to attend to the grease fittings on the front suspension and steering linkage.
Had the car been sitting for a long while before you bought it or was it being driven more or less regularly?
Ray
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