[JayR]

First, as far as can be determined, there were no COPO Novas in 1966. Only the 327/350HP engine made the L79 different from most other 1966 Chevy IIs. The L79 Chevy II engines had suffix codes that ended in ZG, ZI, ZJ, ZK, but most were ZI. A 3 speed column shifted transmission was standard. Wide and close ratio Muncie 4 speeds were optional. There were no L79 automatics. There was no factory gauge package, just a speedo, gas gauge and clock. Knee knocker tachs installed on the bottom of the dash could be obtained from dealers. 3:73 was the best you could order for rear gears from the factory. Posi was optional. Brakes were the same as all other Chevy IIs as were the monoleaf rear springs. The F40 HD suspension was an option. Many L79 Chevy IIs were dealer modified before going to their new owners. The car you have may be one of those. Hope this helps.
Bob