Seems like there are 3 different SAE bellhousings that are useful for the detroit diesel swaps. I'd love to pop one in the 69 and cruise it up and down the road.
I've been thinking if I find a 4-53T first, it'll be swapped into the 69 C10 and if I find a 3-53 first, that will be under the hood of the 87 S10.
good luck