I could be off here, but I was under the impression that the steel ball is your timing mark at idle, there should be an imprinted line about 5 degrees from it that indicates true TDC.

I always set the mix screw in the middle of the recommended settings, so 1/2 to 1 turn, 3/4 would be a good start. Get it started, let it warm up, set idle, check timing, then fiddle with your mix.

At least it's just the 1bbl, imagine tuning a set of quirky 2bbl webers. Ugh!

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P