I have done that swap. I have a 5.0 (that is the H.O.) in my '61 Ranchero.
You need a 50 oz flywheel and balancer.
The oil pan must match the timing cover, ( the early pans had the dipstick in the timing cover, in the later years it goes through the block). Also, your oil pump pickup must match the oil pan you will use. Watch out for the late model timing cover that doesn't have a fuel pump boss, unless you will be using an electric pump.
Make sure you have valvesprings that will handle the roller cam.
It is going to be a tight squeeze getting the engine in and out of the car. I highly recommend taking the engine/tranny combo out in one piece.
You may have to take out the standard transmission pilot bearing in the back of the crankshaft.
I used Hedman headers from a Maverick. It is very tight, but the 1 5/8" ones will fit. They are pretty cheap too.
I also used an 8" rear from a Maverick. It is 1/2" narrower on either side. It will help make room for bigger wheels.