Welcome to car modeling! Now for the not so good news, the Revell kit you mentioned is the closest kit to your subject, the convertable is not done as a mainstream kit. You can cut the roof off of the hardtop and use a few parts (top boot, visors, dog legs, ect) from the Revell 69 Camaro kit, and cutting down the rear seat will need done too. A resin transkit MAY be advailable from the aftermarket.
You can do this subject, but not out of one box.