timing gear alignment.

Now you continue on assembling. Put the distributor in pointing to number 1. Right? WRONG! Because when you time dot to dot at the cam and crank you're timed on #6, not #1. Understand
I'm not, nor was I talking about timing the distributer.
(Timing the distributer is a separate matter)

I was talking timing the valves.

And yes I forgot the op was on a slant so 6 and 12 dont apply.

But having the dots align does (about 10 and 5)

Timing the dist requires the engine to be at tdc on the compression stroke of the #1 cyl.