the early '70's waggy's came with closed knuckle dana 30 fronts. they are 5 on 5.5 bolt circle. waggy d44's are 6 lug. the front is worthless. i'm guessing someone put wagoneer axles under it. the rear is probably a 44 but it will be wider than your open knuckle narrow track 30 you have on your cj. I would say it's a toss up whether to swap axles out or not. you put a bunch of money into your amc20 right? i think the 44 is better though, even with your 1 piece axles.

i think your best bet is to run the axles it has but keep on the lookout for an open knuckle wagoneer 44 front. it will be 6 lug but you can use 1/2 ton ford hubs and rotors for a 5 on 5.5 bolt circle and gain internal selectable hubs(the wagoneer uses drive flanges). i found the parts for the conversion used for $200 but you may find them cheaper. all brand new will be about $450. i also have the same cut on the rear of my tub but i'm not too worried about it. diamond plate sounds like a good idea though if you don't need the room for you tires.

i'm getting ready to scrap one of those closed knuckle 30's along with a waggy carcass. if you want to pay shipping on any of it, i can send drums, shafts, hubs, or whatever your way. i don't recommend dropping a dime on it though.

one other thing. if you have the axles that i think you have, they are wider than your cj. they are 59" wms to wms. the same as yj,tj,toyota. your cj axles are narrower. you will either have to swap in your 30 and 20, or run the axles it has. swapping in your engine/tranny/t-case should be a breeze.