For the most part the basic kits that would be needed to build the SCCA / Trans Am over 2 liter cars are readily available. The Camaro bodies from '67 thru the second generation are well represented. Just use the induction from the Revell '69 Camaro Z28 kit. The Ford Mustang is also available in various year models and again minimal engine modifications. The Chrysler products are also available to a lesser degree and you would need a Chrysler small block to complete the look. The AMC Javelins would be the perfect car for someone to kit. The only ones I remember that may work are the older NASCAR kits that could be easily converted, but find one. I think there would be a small market for say a 2in1 or even a 3in1 kit. I would buy one. This sounds to me like something that Round 2 might do if they have the old molds. The Firebird? I personally would welcome a '69 Firebird, but would enough others share that felling to where it would be profitable ? One thing to remember with the Firebirds, they couldn't build a competitive 305 cu. in. engine from their existing engines at the time. The only really competitive Firebirds were the Canadian models. These were Firebirds built and sold in Canada. Canadian Firebirds often used the Chevrolet engine, and since the Chevrolet 302 could conceptually have been put in a Canadian Firebird that is how Pontiac got around that. And yes some teams got very creative and put Firebird sheet metal on their Camaros and said Yada Yada its a Canadian Firebird.