Problems With an 8.25 - What would you do?

I obtained a 73 A Body 8.25 housing with saddle caps that I was going to use in one of my early A Bodies. I located a Sure Grip unit and a set of 3.21 gears. I also decided to do the Jeep Grand Cherokee disc brake swap and sourced all that stuff as well. I decided to have my local Mopar dealer install the center section and pinion gear and I would finish the disc conversion. Yes, they have a long time mechanic who has the reputation for being the best rear end guy around. I have been advised the pinion depth cannot be set to specs even with 2 new sets of spacers or whatever they're called to set the depth. The mechanic suggested that the ring and pinion gear might not be a matched set, which is a possibility as I bought the gears from another member several years ago. I don't need this rear end as the only A Body I now have is the Dart wagon and it will be getting a ready to install 8.75 with a 3.23 Sure Grip. The plan was get it set up and sell it as a complete unit with the disc brakes. Another local member was very interested in buying it. With the current issues It's not a sellable rear end IMO. I am now leaning towards just parting it out selling the sure grip unit, housing, axles and disc brake stuff rather than spending more money finding a set of brand new gears, pinion bearings and associated stuff to set it up and letting the dealer finish the job ( the work is what you'd call a fill in job and not the going rate so it's not costing but a couple hours of labor. Part the rear end out or buy a set of gears and finish getting it assembled and sell it?