Got the fun of trying to think of every thing needed before strip down begins. Takes a lot of time with nothing to see for it, but essential all the same.
I was able to have the radiator nearly 3" closer than what it was in the Grand. Will still leave me enough room to change a belt. I was careful when removing the drivetrain to keep it at the angle it will remain at once installed. The radiator has also been set to the finished angle to get a better idea of working room behind it.
Another problem I ran into was that because I have to move the axle, steering and suspension etc forward 6" to centre the wheels under the front guards, the oil filter will end up on top of the steering rack. Not a problem for a LHD, but it is for me. But it looks like I can just remove the whole angled filter mount and spin the filter directly onto the block instead and have it vertical.
If I want to mount the Grands firewall in the stock Willys location, I will have to come up with a different power steering and hydraulic fan cooler. Would save loosing interior space, even if it is only a 1.5", but am extending the cab anyway around 6" so not that much of a concern. If I do move the firewall back that far though, I can use the Grands stock aluminium rear drive shaft.
Also moving it back will give me a bit more depth in the dash in front of the windscreen to mount my instruments that in the Grand sat in a leather clad pod into the top of the dash. Will also compare door opening to firewall depths between the two vehicles. The other thing is the cowl vent might end up partially over the firewall so has to be checked as well.
Fun and games.