Okay, Okay!!!
Dana 60 because of the position of the pinion is actually a very efficient rear end, and is not a power robber even though it has a 9-3/4" ring gear.
I run a Mark Williams billet cap on mine (actually I have Mark Williams caps on both sides, but totally not necessary) I just did it because I could. I think the covers are band-aids.
Dana 60 housing can be as cheap as $50 around here, used gear sets are $100, Strange spool (35 spline here) $350, and axles all cost the same.
Use car ends, or in my case I had a junk 9-1/4" housing I robbed them off of.
The one I have in my 63 only cost me $800 complete because I did some thrifty shopping. No 9" Ford can be built anywhere close to that, and as already mentioned.
Dana 60 rules when you look underneath and probably adds at least $1500 to the value of any vehicle that has one.
Tom