[Kevin in NJ]

So to expand more on my brothers comments.

A few years back I mounted new Goodyear tires to my rims.
I set up a spindle with lightly oiled bearings.
I put the mounted tire on it and saw how fast it the heavy spot moved down. I would breaks the bead and rotate the tire and try again. The rim and tire position that gave the slowest drop down is where I put it at.
I will add I have metal valve stems.

It seams these tires had a pretty wide variation on weight. Been a while, but one tire came out almost balanced. Another was pretty close.
2 others were faster in finding bottom.

Keep in mind the A has a lot of unsprung weight so there is a lot of damping. The front is lighter so I put the better balanced wheel in the front and let the worse ones go on the rear.

Dont know how well it runs as I am waiting for my brother to build an engine. But that is another story.