Help on rebuilding a 73 340

Do you know how to do a stall test? Give us an idea as to the current TC.If the teener is sluggish off the line with 3.55s,I would first look to the compression test, and then to the stall.If compression is down around 135,the low rpm torque will be soft and you will need a higher stall, to get the Rs up to where the happy zone is. But if compression is 165 or better, then perhaps the timing is late or slow. Most teeners I have worked on have a generous amount of low RPM torque, even with compression down at 150.So I think those are the three areas you need to respond to; compression test. stall, and timing. Timing includes the idle number,as well as at what rpm its finished advancing,and what that power timing is.
If the idle timing is 10* and the PowerTiming is 35*,That doesnt sound too bad. But if it doesnt get to that 35* until 4000rpm, that would be horrible.And if it lingers at 10* til 2000rpm, well thats even worse.
What I do is make a timing map.I disconnect the vacuum advance and I set the initial,idle timing to TDC. Then I rev it to 2000rpm and record the timing. Then 3000 and record the number.And 4000 as well. Then I go back, and fill in the numbers at 1500,2500, and 3500.Then I get some graph paper and plot the numbers;rpm across the bottom and *advance on the vertical.If the line thus generated has a kink in it, I sometimes go back and check the timings around the kinked area, to fine tune exactly where it is.This graph can be a huge help in tuning.I sometimes generate curves as fine as every 200rpm.
When finished I put the timing back where I found it and hook the vacuum advance back up.Then its time to analyze the results and make a plan.