Which Ignition Box Do I Need

So redfastback if i where to put in stronger springs to delay the curve and put a light spot weld in the slots the weights slid in to stop them for sliding all the way back would this fix my problem. Or do u mean I need to weld something on the vaccum advance.

i am talking only about mechanical(centrifugal) advance. yes you weld it so it doesn't have full motion anymore. where? thats the fun part. its a precise weld. how much advance does it have to start with? this way you can know how much to limit its action. hopefully someone here has the pic or 1 lying around.