I adjusted the valve lash on each cylinder and there is marginal improvement. I now have 16 inches of vacuum. I still have lousy acceleration. By the way, when I adjusted the valve lash I put cam in the proper position. I tightened the rocker arm nuts to the point where each push rod to remove any "spin". I then tightened the nut an additonal full turn. After doing this my engine would not crank. I went back and loosened and readjusted each push rod to just past the no spin point and it turned over and ran with marginal improvement.

Back to the carb, I ran my idle mixture screw all the way in and the engine would not die.

Any comments?

Next step is compression check. How do I know for certain if the cam is truly flat?

Ken