Buddy of mine has the same setup, but no AC. Also, my wife's first husband had a 68 Vette with the 400 HP and AC. Also 4-speed, AM/FM multiplex, and a convertible. Has to be pretty rare.

This car looks to have sold for $24,200 the last time around, but to a bidder who never followed through.... Relisted in the link below and currently at $15k with the reserve not met.

Link to 1966 Impala Super Sport 427 auction