Does my /6 sound right?

Much easier to do the repair correctly rather than making a hassle for yourself futzing around with timing tape -- which, by the way, will not work on a slant-6 crank pulley.

Wow you are right, ( I am sure you haven't heard that before :) )
I can't believe no one makes tape for the SLANT-6.

I guess you would have to make your own tape. should be easy enough.

Measure circumference divide by 72 make every other mark larger.
Should be good enough for setting timing.