Ok, good to know. It should be easy to see if the old bell housing needs to be relieved. Thank youSince you have an early "H55 ready" model (4/85), be sure to check the clearance between the front bearing retainer on the H55 and the bell housing. Some early 3F bell housings have the newer transmission clocking but inadequate clearance for the bearing retainer. I've read about this problem cropping up as late as 10/85, but have no idea how common it is.
It's a quick and easy fix with an angle grinder while it's all apart if you know you need to do it; it's a damper on your day of wrenching when you have to pull it all back out again because the transmission won't seat against the bell housing.
View attachment 1363872
Approximate location where the housing needs to be relieved is shown below in blue sharpie.
View attachment 1363868
Final test fit on the H55 before reinstalling. I had to relieve a little at the top in addition to the points on the side.
View attachment 1363870