Can you swap a 258 amc for 360 how much trouble is it?
It mostly depends on the vehicle it is being swapped in. If the
vehicle had a V8 option from the factory, then it can be a very
straight forward swap. If you are trying to do this in an Eagle,
it'll be a bit more trouble. The motor mounts are different between
the I6's and the V8's. But, if you drill an additional hole in the
passenger side (IIRC) motor mount you can use the I6 mounts. Now
you'll need the proper flywheel or flex-plate to go with the 360 as
it is an externally balanced engine. The rest should all relatively
bolt-up. If you have difficulty sourcing the proper flywheel or
flex-plate, take the original I6 one to your machine shop and have
it balanced for the 360ci specs.(232ci &258ci I6 engines are
neutrally balanced flywheels and make for good blanks)
Hoped this helped. BTW, I personally swapped a 360 into my CJ7
and it was real easy swap.