as lamont said, hitch for sure. Start soaking the bolts as they are low and get all the mud and water and rust up.
Radiator maybe.. if both are the same style then they should interchange. The trick will be if your 830 and the 730 is
1, Case-o-matic or not and 2, are the short hoods or tall hoods (early or mid models)
As lamont said you'll have to measure. post pictures of here and we can see what you're looking at and help you better.