60s /6 to 727 adapter

So? not the adapter plate to the engine side?....
I don't know how I'd do the trans to the adapter side with no room to see the indicator within the bellhousings, with everything bolted up
I'm thinking I'd have to dismantle the trans and put the bare case to the adapter, as the trans pump and input shaft would be nothing but in the way. And then that would give the hole where the valve body now "isn't", and the spinning components out of the way as a window to access and watch the indicator?
Yes, it is done with an empty case..
I guess I should say THE empty case.