I disagree with some of the points in the HPP editorial. The car without engine has limited value, dependent upon condition, style and options. The engine without matching car has limited value, dependent on condition and desirability. There are some cars that the value of the parts is greater than the total of the individual items, and the contributing factors are rarity and desirability. V-8 convertibles, Trans Ams and Ram Airs have that extra "value". IMO, if you can find one needing restoration, they are generally worth restoring.

Although the cost to restore a 350 2bbl 2 speed Firebird and a 400 4 bbl 4 speed Firebird will be similar if the cars were in similar condition, the 400 car will be more marketable and command a higher price. Neither might sell for what restoration cost. So build what you like and enjoy it.

Reproduction parts are good and bad. A lot of cars were scrapped before repro parts were available, when originals were hard to find. Now every car is technically rebuildable, but at what cost? Reproduction of rare parts somewhat dilutes the value of the original rare parts but allows for restoration of rare cars. Reproduction of common parts keeps cars alive.