[HO455]

Originally Posted by 67 twins

I'm not sure what you mean by dial in. The bellhousing locates to pins in the engine block. The transmission centers to the hole in bellhousing. What else is there to do?

Here is some more information on misalignment issues. It doesn't take long to do and keeps from having to pull the transmission or engine for a major failure several thousand miles down the road.
When you are using a group of parts that didn't come from the factory together and were manufactured with different tolerance standards the odds for failure go up. Over the decades companies change how they do things. Not every 3/8 alignment pin and hole is set up the same. For example are the holes in the 67 bell housing 0.375 and the engine pins 2 or 5 thousands undersize to allow for manufacturing tolerances? Or are the pins exactly 0.375 and the holes oversized to compensate for any oversized pins? Did GM use the same procedure on vehicles manufactured in the 1990's? Is the T-5 pilot a metric equivalent of a fractional pilot?
Too many variables that cause expensive heart aches for my peace of mind.

https://www.hotrod.com/articles/ctrp...ing-alignment/

https://youtu.be/3ngXGrg6Y1s