Corvette is a great game. If you have a spare set of Sys11 drop targets, I suggest putting the drop targets back in the game.
I have a frankenproto Corvette pin - a NOS wired prototype Corvette playfield dropped in a production corvette cabinet from a partout. I pulled the playfield out of the rafters of a corvette speed shop in Bowling Green, KY USA - Bowling Green is where Chevrolet builds the Corvette.
George Gomez and team took prototype Corvette pins to the Corvette Museum in Bowling Green back when the museum opened.
The guy I got the playfield from bought a game, and bought a spare wired playfield for parts. When he sold the game to someone, the person didn't want the spare playfield. So, he put it on eBay.
The prototype Corvette playfields have some neat differences. George filled me in on most of them. The yellow inserts with the cars are blue with a neat overlay on them. A few protos had a 4 speed shifter assy on the side of the cabinet. I'm working on retrofitting this to my Corvette.