we have successfully fitted a BA 4ltr into a AU falcon , and got it running using the AU
PCM.
it just clears the bonnet (with a slight re-mould of 1 of the bonnet ribs)
hooks up using the AU coil pack , and most AU accessories.
no cutting of wiring looms it all just plug together , some brakets need to be made for water pipes, accel cable and a/c pump
new hose needs to be made for power steering .
this is a engine change that could be done in a weekend
i will be developing this conversion in the next few weeks, and running a car up on the dyno to see what power we can get out of it.