Holley fuel idle trim setting

Just a side note on the timing issue. With todays crappy fuel the old all in at 2500 timing advance is not very practical or effective in many applications. In cars with a fairly tight stock converter you will most likely end up with the small factory advance spring and one of the super light replacement springs. This gives you a more gradual advance from a increased initial timing setting. You will still need to limit mechanical advance in the prescribed ways. Usually that is by shortening the outer end of the slots the advance weight pins move in.