I'm not an expert, but I will start things off with my opinion.
As far as value, that will elicit a wide variety of responses. I will only say that a restored 72T recently sold on ebay for $20K +:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=130126415316&ssPa geName=STRK:MEWA:IT&ih=003
You are looking at an E, a rarer car. A lot depends on the documentation of the restoration--there are various meanings of the term "ground up restoration," and the final outcome. The car will never be original nor claim the prices of an unrestored original, so the concern should be, IMO, on the current history of the car.
To your questions:
Value? Not sure without pics, and docs. Probably over the 25K mark if in stock configuration. Nice 73E on ebay was posted for 35K and got no bids. 72 is a one year configuration and, for some, will command a better price. These comments are just a shot in the dark. I'll let others suggest prices.
Is the motor an E motor, with an E case, or a non matching case built to E specs? This will make some difference. If it's an E number motor from 72 but not the one that left the factory in the car, that shouldn't make much difference as the car has been restored anyway. If it is a non number matching motor, then that could drop the value as most people who seek out the E cars want an E numbered motor. Only a COA would show the engine is not original to the car. Does the engine have MFI? Was the MFI removed and replaced by carbs? These questions will affect value too.
If the VIN is E and the engine is E, the car should have no trouble holding value, and actually appreciate. The lack of history prior to restoration will help set the selling price now, and have lesser effect on selling price later. The history of the restoration and since it, will be an asset to future sales.
From what you posted, you want to use the car and enjoy it and not depend on it as an investment. If the car is what you describe, considering some of the points I made, you should not worry about losing money by owining the car and driving it. What you should pay now, I can't say. A good ,solid, quality restored 72E should not go cheap.