Sounds like you are on the right track. Make sure you get valve springs matched to the new cam, check install height (Summit Racing has valve spring micrometers) and make sure retainer does not contact valve seal at max lift. You should be able to get 500 ft/pds of torque out of that with that carb and the right cam. Brian at IMM can hook you up with the right parts or find an engine builder you trust and work with him. Do not try and make these decisions on your own, get an expert involved.