[John Brown]

According to Hollander, El Camino and Station Wagon only interchange with each other. All other 64-65 Chevelle convertables use the following;

64, 65, 66 Chevelle convertable frames interchange with each other.

64-65-66 2 door sedan, 4 door sedan, 2 door hardtop and 66 4 door hardtop frames can be used but you would have to juggle transmission crossmembers. No doubt they are not boxed like convertables. No interchanges listed with Buick, Olds and Pontiac.