There is a little more work to fit the A14/15 in the 1000 than in an early 1200 ute, but as engine swaps go, it's still pretty much straightfoward.

If you use the 1000 gearbox, you will need to shorten the spiggot part of the gearbox input shaft or else it will bottom out in the crankshaft & prevent the gearbox from bolting up to the engine. There are some minor issues with the clutch release bearing too [use a 1200 assembly] but nothing too dramatic.