[A310]

I don't have a book on the housing part numbers, but I do have a #3 housing in the shop I can check tomorrow and find the casing numbers.

 

[A310]

I couldn't find the castings numbers but did measure the bolt centers it was 4 3/8" and diameter bolt centers was 16 7/8". This is a #3 housing and I recently found a #3 flywheel for it.

 

[A310]

Great, thank you so much for checking. I suspected it was an SAE #3, and others were copying/pasting bad info stating it was a #4.

Casting numbers are on the lower backside, facing the oilpan.

Thanks I'll see if I can find it today.

 

[A310]

Here's the casting number for the #3 housing.