BigOlDog
Let me approach this from a general point of view and see if I can address your questions. In the past (more than 10 years ago) original numbers matching vehicles were much more desired than those that were not, and this was reflected in the values. Today, driveablity is desired by many. This means going faster, stopping faster with comfort (meaning souped up or more modern engines that go freeway speeds, disc brakes, air conditioning and a quality sound system). Look at recent high end auctions for confirmation. At Barrett-Jackson last year a 50s Chevy cab over engine truck went for $98,000 (with buyers premium) that looks very similar to mine. It had been highly customized with a V8, airconditioning, etc. Since mine is largely stock (meaning it is screaming down the freeway at an astonishing 55 mph, can't hear the 6 volt am radio over the engine/road noise, engine heat creeping up from the floor) I would be shocked if someone would pay more than $30K for mine (not for sale, anyway). Or note the sixties Corvettes that go for top dollar with a new Corvette engine dropped in place of the old school 327. Yes, there are people who still value the original vehicles but the landscape is changing.
Regarding our trucks, there is no build sheet or ID plate with paint codes, so we can change colors, add or remove accessories and still remain "correct". A very nice pick up with a later stovebolt engine properly placed may very well command a higher price than one of equal condition with the original babbit pounder splash oiler. It will depend upon the buyer's point of view on these issues.
At this point I don't think it matters much at all to the Stovebolts. The most important features of your investment would be overall condition. We all like intact rust free bodies and lack of irreversible custom changes,
Kent
