Converting TH400 auto to NV440 manual

[bonehead]

I am collecting parts for my 1966 C-10. In the fall I am planning on changing over from a TH400 auto to a NP440 manual.

My truck had the stock transmision crossmember removed by the PO, so I will be using a rear tranny mount from the auto moved to the new location for the manual trans. So I have to use an aluminum bellhousing instead of a cast iron one, or should I use the cast iron stock bellhousing without the bellhousing mounts? I will have to get the different starter too.

I have found the following bellhousing for a good price:

#460486
SB & BB with 5 1/8” center hole
Ball boss
Aluminum
12” clutch
168 tooth flywheel

My question for you experts is can I use the stock cast clutch fork with the aluminum bell housing? The rest of the clutch lingage will be stock 1966 as well. I did a search and did not see this info.

Straighten me out if I have some of this info wrong please.