Last year I swapped a 78 D44 and a 79 D60 from Ford F250 donors into my XJ. Mine appear to be exactly like the axles you have. You could have the passenger knuckle drilled and tapped, buy high steer arms, and order custom fit draglink and tie rod for less than the kit you are planning to buy. Also, I did not bother turning the inner C's. The high pinion D44 from the F250 is pretty close to start with and I didn't feel it was worth the effort. I have no vibes, no wooble, and no bumpsteer. I can drive 75 on the freeway with no issues. The brakes are not the greatest, pedal is a little low. I'm piecing together a hydroboost setup right now. There are some issues with the F250 D44, particularly the cast in leaf spring mount and the 1330 yoke. The D60 won't hadle 35 spline shafts without boring the spindles, which you can do yourself. Also, my D60 had a non-standard pinion Yoke wich required a special ujoint. I did a detailed write up, showing every step with about 120 pics, if you're interested. Link is in my sig.
Good luck.
edit..... I just noticed you said the d44 was low pinion... so I guess your axles are not the same, I didn't know Ford ever used a low pinion D44.... oh well.