You're not going to find anything that will allow it to simply bolt up.
Only a Y-Block bellhousing will mount to a Y-Block, so the 6 cyl. bellhousing will not work.
There are only two options for a truck, a 3 speed or 4 speed bellhousing. The 3 speed unit will have the same transmission bolt pattern as your 6cyl bellhousing. The 4 speed uses a wider rectangular pattern. This ebay listing shows that pattern,
http://www.ebay.com/itm/Ford-Y-Block-bellhousing-3-and-4-speed-/192045908720?hash=item2cb6d402f0:g:k4IAAOSwux5YRZtm&vxp=mtr . The listing identifies it as 3 and 4 speed. That is incorrect. It is only for 4 speed. Which ever of those patterns is closest to the T10 is the bellhousing you want to start with.
The other concern is input shaft length, it will probably be shorter than the stock transmission, which complicates the install. You might be able to get around that using a car bellhousing but then you have to make mounts to support the engine since the ears will no longer be available.
Lawrenceville, GA