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Also, what do you all think is the rarest / most desirable of the 66 / 67 Chevelles?
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Well, clearly the most desirable 66 or 67 Chevelle SS is the L-78 version. Only 3099 made in 1966 and only 612 in 67 ( though both could include Elcamino as well )
66 L-78's only saw 12 with installed M-22 4 speed trans., so one of those 12 ( documented ) would clearly be most valuable IMO. 67 did not see any with an M-22 FWIW. As for 66 or 67 SS 427, that would be a Dealer Install, very common...sometimes done immediately and hence leading to the many many stories that it came from the factory like that...why? because as soon as it got to the owner's home and all the locals saw it, they had to assume it was original...emblems and all
Most valuable is always going to be the one that is either well documented, low mile survivor in A+ condition or the Fully Restored to original, well documented in A+ condition car.