Rearend is the original unit and has 4.10's in it. It actually came out of a 55 wagon. In the 60's it was a drag car with a 421 Pontiac in it and had a Chevy rearend in it. In the late 60's my Dad decided was time to put it back original and picked up a 55 wagon, of which he wishes he kept. It was a 2dr wagon!! Anyway, we're likely going to have to put some steeper gears in it so it's an easier cruiser. Maybe 3.08's or something in that range.
Meanwhile, we've got a new tank coming, fuel pump and some other goodies. Hope to get it running THIS weekend possibly. Then move onward. My only fear is this puddle of oil my Wife noticed last weekend under the car. Without going under for a closer look, I FEAR it's a rear seal. If that is the case, how challenging is that to replace with the engine IN the car? Can it be done? There isn't time to pull the engine to do this as we have a deadline. The big idea is to have it ready late this month or first week of June. We want to drive it to Gulfport Missippi (from St.Louis). My cousin is getting married and we thought it would be so cool to take The Bird for a roadtrip. If in fact it's got a bum rear seal, that will likely put the stops to the road trip idea

. Tried searching around here on rear seal replacement IN car but only came up with a few posts saying people had done it. No real play by play on how this is accomplished. We'll see but hopefully someone can enlighten me

Aside from that, the only other scary unknown is the power steering system. I went through the pump and cleaned it and checked over everything else. However, again........my Wife noticed a leak at the bottom of the power steering pump. Soooooooo, I can almost bet ya once it's running the pump is gonna spew not to mention the lines and all that will be questionable. They were replaced years ago but years ago means like maybe 1965! We'll see.
Electrical will be the last exciting part. The Bird's life was a good one but underdash wiring has been modified, not hacked, just rearranged we'll say. Guess we'll start from scratch and put everything back where it's supposed to be and double check it all. That and replacing all the bulbs with 12V units. Interior wiring on back to the tail lights is fine. With the battery in it the other weekend, headlights worked, tail lights (less brake lights due to dead switch) some interior/dash lights, blower motor, etc. Engine bay is crispy from the big fire breathing engine (s) it had when it was a drag car. Will have to replace some looms and repair others for sure.
Should be updating later this weekend.
Thanks for all the help thus far. Gotta get ya'll some pics