I was going to run an RPM or Air Gap on this 318/341 with a similar 3.55" stroke but at 2700 pounds and 85" wheelbase I wanted to kill some torque down low and move it upstairs, I'm going with the M1 which will be a little weaker below the torque peak but (with my heada and cam) should make a little bit more between 5200 and 6500. I also widened the lobe centers from 108 top 112 for the same reason. with your stall you're at the threshhold where the M1 might be a good trade-off but unless your heads are well ported you may not have enough Airflow/cam where the bigger runner/less restricted intake can pay off.

I agree you probably need some suspension tuning to get more hook/use out of the torque you got. Try hooking up a 12:1 517" motor on drag radials....you think YOU got problems