Almost everything will swap over ... does the car have A/C or an air grabber hood , there are 440 or 383 specific parts associated with them ? The only thing bolted to the head without A/C is the long bolt thru the alternator and the bracket that is on the 383 has 2 holes , one for a 383 and the other 4 a 440. The power steering attaches to the water pump only so that is not an issue. If the 440 is from a C body the pan will fit in the 71 K with no issues, but it won't have an internal baffle like the Stock 402 pan on your 383. If it's from a B body it will have a 402 pan if stock.

Engine mounts are the same.

If you have Air grabber the air cleaner base is different.