"And by the dumbest luck, I stumbled onto a 64 Convertible."
"So begins my fustration with the pontiacs. I must have ordered at least 4 phs on different cars but they all came back as plain lemans."
The '64-'65 GTO was an option on the Lemans and not a separate model, thus the Lemans.
"I found an engine block with the correct date code and cast number. I plan to have it decked and restamped to match the PHS for it."
- I find this sort of thing underhanded. I don't condone this type of thing any more than removing the vin/data plate from one rust bucket of a car and placing it on another rust free body and claiming/selling it as original to reclaim a higher "original resale value" to an unsuspecting car enthusiast. -sorry, just how I feel about it.
"Now the crap part is I did not realize how hard parts are to find for this thing. I normally would not have cared if parts were original but everyone who sees the car tells me how rare the thing is and that I should keep it as close to original as i can."
-Yes, the '64 GTO convertible would be a "rare" car. In 1965, the engine was somewhat redesigned, so your engine falls into the '64 and earlier design which also makes it unique among GTO's. I frequent cars shows/swap meets and find Pontiac cars or parts to be in extremely low numbers with parts commanding high prices. Anything that is not Chevy or Ford always pulls higher prices whether you are restoring or rebuilding. The cautionary part is that you can wind up investing more money in the car than you will get in return, even if it is "rare."