340 Chugging instead of Reving

Later today I expect to have time to work on it again. Locking out the distributor seems to be a popular suggestion and I agree, it will remove another variable of the curve coming into effect. I have never locked a distributor before but when I disassembled it to set the mechanical advance, I see there are two set screws on the outer housing that seem to be used for locking the position. Since the current mechanical advance is set at 24, do I need to change that internally to 32, then lock it? Or can the lock screws be turned in and adjust the dist to 32 with a timing light.
When you lock it, you dont have to set anything. Just follow the directions Mallory has for locking that distributor. Then stab it and set the timing at 32 with a light. At any engine speed the timing should stay at 32.