I have a 1973 350 block and heads which I installed a 1985 tpi unit converted to speed density.My question is that the car runs but really poorly and wont idle.I have a 730 ecm and the cam specs at .420intake,.443exhaust.204intake@.050dur,214@.050dur.I called up summit racing and the tech told me the cam wasnt compatible with the chip in the computer.He told me it would be $375 to get a custom one for me.Does anyone think that the cam cant run with the stock chip?Any help would appreciate any feedback!