Need a little guidance from the gurus

The light duty 1 ton "van style" motorhomes, you know with a "van nose" are NOT likely to have the oddball 727. They will most likely have a normal, long shaft, slip yoke 727. I with above, tho, I say stay with small block.

If you get a 360LA youll need a "car" 360 pan (not 318) and pickup, of course engine brackets to match your body, and exhaust manifolds / headers for your body.