SmokinCAT
Cheap and Easy.
How is the stock timing on the 531? Slow enough for some more fuel without rattling the heads off?
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Yeah. Set at .070"
Always springs, I took almost 7/16" worth of shims out of my competition pump when I swapped to a proper spring and didn't lose rpm.
I like having a pressure gauge, but once set I probably wouldn't be running one on a road truck, I use an autometer 2 5/8" liquid filled gauge to 600psi, they offer 200 and 400, a road truck should never see 400.
Part number 144478 is the spring I use, put it in with very few shims, prolly drop down to a #15 button while you are in there.
Oh and for responsiveness back the android screw out some, it is right above the throttle shaft behind the tin plate.