I'm installing a used QT bellhousing on my 70 Duster with a 318. Transmission is an 18 spline A body four speed. The engine is in the car.

The instructions I found online recommend indexing the bellhousing to correct any misalignment between the engine and transmission. I understand that this is critical when using a TKX or TKO due to the tapered input shaft bearing. Is this process necessary when using a NP transmission with it's roller bearings?

I'm working by myself and it is impossible to rotate the front of the engine and watch the bell from the back. Thanks for any help or guidance!