Actually, cummins does make an adapter for the 385 series (460) engine. I have one in my truck. Supposed to get the number for Bob but hospital stay and family death and I forgot until now. No excuse, sorry Bob! I will try to get the numbers and description of install to you. It does require some machining but adapter cost plus machine work was still $100 cheaper than ford-cummins.Not an OEM adapter only aftermarket such as fordcummins.com.