18 to 30 degrees, that's only 12 degrees. Try to open it up so maybe 13 to 37 with med springs. The higher timing should help at cruise speed. If the engine has a bigger cam you probably need more main jet and idle jet. What is the idle vac, and I mean 550 to 650 rpm, if you can't get that low there's one of the problems.

Last edited by cudaman1969; 05/01/15 08:37 PM.