Now finally getting to the fine tuning on my car. I have a Mallory Unilite billet distributor, no vacuum advance on my stock 5.0 with a 4-bbl carb. It works fine, no problems. I am curious about changing advance rates and limits. Are these distributors adjustable? If so, how?
They should come with a little plastic Key that you use to change the advance rates.
That is what mine has, but I have had it for 15 years. The new ones may be different.