Cool Dave’s 1973 Dodge D100 Club Cab
The engine is stock, set the timing up accordingly. Get a service manual and set up timing based on that. The stock distributor probably has a very long slow curve in it and bumping up the initial without fixing the centrifugal will cause problems. The vacuum advance should be on ported vacuum at this point. You don’t need a bunch of initial timing with a stock camshaft and a stock distributor. The best thing you can do is modify the distributor to bring in less centrifugal advance so you can add initial and not over time the total.