Aw come on. Don't be silly. There's guys right here
on OB that say they can do a quality conversion for
2-4K. Including the motor and trans.
Just ask them.
They know everything,
even though
they've never even done a conversion, or paid for one.
Hold on just a minute.
I have done a complete engine/transmission conversion, "complicated wiring" and all.
I may not know everything; and don't begin to claim to; but, I did do an engine swap in my truck and was not fool enough to let someone take me to the cleaners on the cost of my parts.
I bought an engine/transmission combo, out of a 68,000 mile wrecked Dodge, for a grand total of $2700, gave Randy at Reliable Diesel some over $200 for a set of mounts, and made a few brackets, swapped a yoke in a drive-shaft, and drove her down the road.
Nothing about the engine swap is second rate, every Ford factory gauge is functioning, the Ford Air-Conditioner is still ice-cold, the Ford alternator still keeps all the lights lit and charges the batteries, everything about the engine swap is better than the truck was new.
You are welcome to have a look under the hood and criticize my work, at any time.
As for paying for the "conversion", I counted the hundred dollar bills across the truck-flat to pay for the engine, and didn't borrow a cent.
A comment like yours would have been expected from over at TDS, but is surprising to be found here.