If this has already been suggested by anyone before me, sorry for the duplication.

My $.02 (ignoring the CR being way too high for pump gas):
- A singe-pattern 220-224 at .050, or only a 2-4 degree split on the exhaust
- LSA 112-114 since the exhaust system is sub-par and you don't want too much overlap

I don't see the need for extra exhaust duration cuz it's not gonna want to rev anyway with the restrictive stock top-end stuff. It'll probably start running out of breath around 5000 RPM. If you upgraded to a 6-bbl setup, then the extra exhaust duration could help some.

Keep all the torque you can for the heavy car and long gears. You can't "crutch it" with a performance converter's higher-than-stock stall, which requires a fairly small cam to retain decent low-speed drivability and throttle response.

It'll be nicer to drive in general, even if it MIGHT give up a few HP at peak power. This could be one of those combinations were a bigger cam won't do anything but LOSE torque across the usable RPM range, gaining you nothing.