I'll go from memory, which deceives me a lot these days Big Dave seems to be a walking Chevy/GM encyclopedia so he and others can probably confirm. In short, the answer to your question is no. -- But with brackets or some minor fabrication = yes. If I recall, 1958 through 1964 models used an x shaped frame. In 1965 the impala was entirely redesigned. The cars became wider, the seat tracks changed, and the frame and floor pan contour also was re designed. So while they may look similar on appearance, the underneath reveals extensive differences. So it would not be a straight swap from the 67 into the 64. Hope that helps.