[LX5liter]

I've never done the 351w swap, but I'll state the obvious.
You can use the long block and the lower intake. Keep the 351 flywheel and harmonic balancer as well, as these will be the 28oz matched set.

The things you will need: oil pan, headers, motor mounts, different brake booster (possibly), and there is accessory drive considerations as well. These are some part #'s from the technical reference handbook that should help with the accessory drive; M-8510-C351 (crank pulley spacer, FRPP #) and M-8511-B351 ( FRPP# for mounting plate to use the standard power steering pump and A/C compressor).
There is probably a whole slew of stuff I am missing here that someone who has actually done the swap can fill you in on, but this should give you a rough idea as to what's involved.