As 1971ls6 says; "I have a distributor machine and without it you cannot get it right without a lot of trials in the car."
It is a tall order with lots of trial and error to do one on the car, not impossible but my aching back would kill me with all those over the car adjustments.
Interesting though hardest time I had with my 480 distributor on my Sun machine was getting it to hold and come in at 1050 rpm These 302 cars like to idle at 900rpm plus and you can't have any curve come in at idle or it with dither like the dickens at idle. So if you can't set one up I'd say send one out for a curve. Mine is 1050~1100 to 2800 rpm 12 degrees or 24 total bushing restricting slot. Advance 12 degrees and distributor vac can with limiter for 10 degrees more.