I have not given up - like the mid range performance improvements even though the stumble on takeoff is driving me crazy.
Changed to Accel. Pump cam from white to orange. The orange cam has the 2nd longest shooter time of the 8 available and the 3rd largest cam rise. Also adjusted the throttle lever to have zero clearance with the pump arm. Adjusted the idle mixture screws to give max. manifold vacuum reading at idle (18 in. Hg.).
Less stumble noticeable but still there. I now plan to increase the shooter from 25 to 28 or so to see if that helps.
The power valve was changed from 8.5 to 9.5 in Hg. opening but that did not seem to do much.
Thanks again for all the inputs. I'm learning something useful.
