If you can marry the Jag borg warner/ turbo300? gearbox to the ford engine without modifying the rr cross member then engineering will be easier.

My problem with any conversion using eb ed ef el 6s is the difficulty/frequency in doing headgaskets (with the stalky bit that comes up through) the inlet manifold, and the difficulty in access to the dizzy.

(these can be alleviated by fitting an aftermarket sensor lower in the coolant flow and using a set of "rule" dumb dumb auto cut out gauges. These can be fitted and calibrated so that the engine cuts out before a critical temperature or lapse in oil pressure occurs)

Basically the temperature senders are positioned too high on the head at the rr of the engine. There is a bypass hose at the rr when/if this hose fails an extremely small coolant temp rise is evident however as soon as the coolant leaks enough so that gas/steam rather than coolant is touching the sensor then the actual coolant temp is not recorded and returns to normal...sometimes cooler than normal.

Hence the sad sad story I have heard many many times from customers upon inquisition

"nup no temp rise....there was just this rubber burning smell and a clatter bang, then steam..... and it stopped.....waddya mean seized?? are you sure it is the headgasket??....are you sure that the rings are now soft???..."

yup,yup and yup