Hi, is a /6 and small block V8 bellhousing pattern the same?

I have a 67 D200 4 door that had a 318 and 4 speed. But they are gone and I'd like to get the truck back on the road.

For donors, I have a granny gear 4 speed and slant 6 in an old junk 66 D300, and a 318/ automatic in a junk 67 Belvedere. I was thinking the 318 from the Belevdere and the bellhousing and trans from the D300 could go into the 67 D200. Will it work?

Thanks, Joel