A couple issues that you will need to work through. If you plan on running a carb then you will have a issue of mounting the AC compressor. Without the AC compressor the belt will be to long.

There is no provision to use a mech fuel pump with the motor unless you swap out the timing chain cover and either use one of the Crate Motor cams that have the ecentric on the nose or get an adaptor.

The 904 will work with a couple fixes. The 5.9 and 360's have a different balance. You either need to get the correct weights for your torque converter or run a weighted flex plate and a neutral converter. As stated before use good parts in the tranny and you will not have any issues. Going to a manual valve body will save tons of heart ache trying to get the geometry of the kick down lever/cable set up.

While the mag heads are better then most of the LA heads they have a tendency to crack, hughes RAM heads are a good option with larger valves.

Oil pan will be your next issue, more then likely the engine was pulled from a truck, you will need a pan and oil pickup from a 360 car or go aftermarket.

Keeping the high output alternator will require a wire upgrade for older 35/60 amp vehicles.

Good luck and have fun.