If the bell-housing had been circular, I would have assumed it was an SAE, but it isn't. It's about the same shape as the small-block pattern, but bigger. In fact, I thought it was a standard small-block housing until I held it up to the engine. The adaptor ring is long gone. It went with the engine decades ago, so I don't have access to it. In any case, I probably couldn't use this bell-housing with an adaptor, because it's already about 1 1/2 inches longer than the 270 housing and a ring would make it still longer.
I'm not sure what the bus transmission is, except that it appears to be a 4-speed and it's even bigger than the Clark 204.I'm pretty well stuck with the Clark unless I can find a replacement that has a pto in the right place.
I'll try to find the gentleman in WA who makes the adaptor you mentioned, and see if has anything to go the other way (modern engine on 235/270/302 bellhousing)
Another of the several options I'm considering is a 302. It has both advantages and disadvantages compared to the 250 series, but if it really is a bolt-in as I've been told, that could be the clincher. Comments?
The original plan was (is) a Perkins 6-354, but it looks like a tight fit. The main problem is going to be getting the crankshaft centreline low enough for the transmission to line up with the transfer case. This is still the preferred option, but in case it turns out to be more trouble than it's worth, I'm exploring other possibilities.
Plan D is doing whatever work the original 270 needs and bolting it back in. At least I know it fits, but I just can't ever seem to leave well enough alone.
