Just a little update lads.
We picked up the Flareside body kindly identified by Maxprint from the eBay seller in Croydon for £33
It is in good condition, the ally sides and back are undamaged but some of the plastics are a bit poor, still a good buy though.
Got the engine back in the Surrogate Mother to enable the gearbox mounting to be fabricated;

Glad Imageshack works as Photobucket appears to be 'on one'

Sorry that the picture is a bit dark, but I have managed to use the original gearbox mounting, rotating the crossmember around 180degrees and moving the front fixing into the chassis back onto the rear chassis fixing, re-drilling the chassis for the other fixing towards the rear of the van.
It has been decided to lower the engine by swapping the engine mountings from left to right, this will drop the engine by 52mm and fit a 'front bowel sump pan', this will come from a front wheel drive Cadillac Eldorado which uses the same engine block!
We have the front part of the Caddy prop shaft, but with the additional length of the gearbox, (compared to the Mt75), the front prop shaft joint is further rear than the center bearing mounting, so a single piece prop will be produced.
Other interesting ideas are to place the gearbox dip stick tube through the gear leaver hole, it is quite close, perhaps fitting the Mt75 gear knob to the dip stick. That should confuse 'unauthorised users', since there will be NO clutch pedal
We did have the engine running, sort of, on the floor, the manual fuel pump was working well but the carb appears to be a little 'gummed up'. With a small amount of fuel tipped into the carb we managed to have some flames from the headers
More to come
TIM