I made a rear sump for the 318 Poly in my 32-5window. Bloke I knew had a 360 out of a motor-home and was willing to part with the sump, oil pick-up and dipstick. Pretty rare parts to find here in Australia. 360 has a bigger rear main seal so welded in one from a 318 sump and has worked fine for the last 13 years. Doubt that Dodge 270's were ever used in motor-homes though, maybe trucks or pickups as you said.