Noone knows how many L89 ragtops there were. 11 is a guess, I think it's more than that, seeing I know of 3 plus the two pacers. Still, they are rare.
It would have been nice to have one clean pic of the whole pad, but I don't see any issues with the engine pad. The first 5 digits of the engine partial VIN match with another known block. Yes, the other pad has a foot on the 1.