Miguel, You will find that the low cost and high availability of finding junkyard engines tempts you into s deep hole of cash for the install in the long run.
Unless you can fabricate your own mounts, you're stuck with paying for them.
The front end accessory drives often have fitment issues with classic cars at the frame rails and K member. There are aftermarket front covers/accessory drives but they aren't $59 at Auto Zone.
The electronics have become easier but that is another expense you don't deal with on a classic engine.
If you skip EFI. carbureted intakes are available but not many are made so the prices are not like a swap meet 440 Performer.