T56 bellhousing alignment
I'm adapting an LS1 T56 with stock bellhousing to an unusual engine choice using a homemade adapter plate. I need to align the bellhousing to the engine to make sure my crank and input shaft center lines are within spec of one another. This is usually a pretty straight forward process, except for the fact that the T56 bell doesn't have a nice round hole in the back like most bellhousings do.
Any ideas? The only two options that I can see are:
1: Source a Chevy bellhousing with a round hole in the back and trust that the factory's quality control is good enough that both bells are within spec to one another.
2: Have a back plate machined for the T56 bell JUST to do an alignment with.
Not terribly excited about either of those options. Anybody have any other ideas?