I'm in the process of doing an engine conversion on my 65 Dormobile. 2.25 petrol is coming out, along with the series tranny and xfer case. Engine bottom end is toast, but the head was re-done with hardened valve seats etc to run on unleaded fuel. Approx 20k miles on the head, and it's for sale. Tranny and xfer case also on the market.
Engine work on the 200Tdi that's on the schedule for now is to replace the rear main seal and the timing belt.. once that's done, we'll start attacking the "to do" list of fitting the 200Tdi / LT 77 / LT230 into my rig. The LT230 will be getting the part time 4X4 conversion. fun fun fun.