Thanks for the input - you right on the above. We have successfully got it back together using the old Throttle body and the new gear lever all with original wiring etc apart from the exhaust sensor. Would be good to get comments if anyone else has done it. We will update once we get the fluids in etc to see how things will runThat could be...interesting - gen2 has a different intake port bolt spacing, intake manifold & throttle body for starters, and the gen2 throttle body isn't compatible with gen1 wiring (as far as I know). It looks the same but once you go to fit it the holes don't line up. A friend recently tried to fit gen1 kit to a gen2 motor recently and discovered how badly it didn't fit.
Also the gears work the other way around, though I guess you ought to be able to fit a gen2 shifter.
There may also be wiring differences but haven't got a gen2 so can't really comment further.