Hi Tom,

Good question - I'm interested in acheiving the same thing. Eliminating vac retard entirely, and modifying the mechanical advance probably won't provide optimum performance.

I have temporarily adjusted my timing to compensate for the vac retard problem at 3000RPM. Performance at higher RPM has improved, but of course now the idle is too advanced.

Ideally, I would like to use early 113 timing, but I don't know how best to acheive that. Perhaps the throttle switch on the venturi can be rewired to shut off the vac advance when the throttle opens?

Steve