Welcome to the site!
It would take well over 100K to do that car properly. And then you'd have a $50K car with 100K into it. Sadly it's nothing but a parts car now, and only the shaker parts and drivetrain are the only salvageable parts. If it was a RA4 it would be worth restoring.
That car is worth about $7500 and that is just for the drivetrain/shaker setup. I really doubt it has the original carb still. Without that carb, deduct another $1500.
NOS 1/4 panel...$5000 for a pair
1970-72 Front fenders...$4000 for a used pair (NOS don't exist because the GM replacements used a different internal bulkhead design)
NOS tail panel (no-one makes a repro)...$2000
1970-only hood...$1500
NOS fender flares...$1500 set (no=one makes a decent repro)
NOS dash pad...$2000 (or Just Dashes redo, same price)
4-speed Radiator...$1000
Engine rebuild...$7,000 if the block is salvageable (imagine the rust in there!)
Bodywork by the hour....$50,000++++
and it goes on forever....
Heck, even the shifter knob goes for $300:
http://cgi.ebay.com/ebaymotors/NOS-SHIFT...A1%7C240%3A1318
I love how the seller says: "subframe is probably OK"
Yeah, probably OK to use as a base for my retirement home rocking chair.
