Cam for torque question

Tune it is what I would do. There is no reason an engine as described should be puking exhaust that smells like a leaking fuel truck.

What is the idle rpm in park and in gear? If it's dropping a lot, that could be not enough initial timing or a tight converter. Give the engine as much initial timing as it can handle and still start when warmed up. Alter the mechanical advance to hit your total number.