What bellhousing do I need?

Current setup is an ‘84 D100 shortbed. 225 /6 with the A833 4spd manual.
I’m looking to remove/swap the /6 with a early 70s model LA318 but wanting to keep my 833 4spd.
I can’t find a for sure answer on exactly what bellhousing and flywheel I need. And any other information I may need to know.
Any help is very, very much appreciated as I’ve already bought the motor. And this is my daily driven truck.

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