My opinion is that you will NEVER see a profit on a restoration. To get a basic restoration done, to get the car drive-able while doing all the work yourself is going to cost over $20,000 (trust me!). To get the car in "show quality" condition, very few individuals can do all the work themselves. Just a high end, base coat clear coat paint job is going to run you $3,000-5,000 for a SINGLE COLOR from a reputable paint shop. Nuts and bolts alone are going to cost well over $1,000. I would build the car like "I" wanted and not care about the resale value. It's a hobby, not an investment like it once was. For the price you could make it "all original", you could have in place a modern 6.1 Hemi with a six speed and disc brakes all around, etc. This will get you FAR MORE looks at ANY car show than a plain ol' bland restoration project. More people surround my car because of the roadrunner decals and pistol grip shifter than they do a $120,000 Corvette ZR1. Personality is what a muscle car is, and always should be. Don't make it into a car that you cannot enjoy because it is too nice to even take out on a sunny day. Hope you do the 'right' thing, and stuff a big inch' hemi and terrorize the streets like the car was designed to do! Take care.