I have a 1967 rs Camaro. I got her in pieces, with no engine. It's been over 10 years now and I am almost done. The question I have is this. What are these motor mounts for? The numbers on the mounts are 3912597 for the left and nothing I can find on the right. I even sand blasted them an can't find the # on the right. I was positive the tag translated to a 6 cylinder, but I can only find this # for a 396. Iis that possible or did they use this mount for another engine. ie. 6 cylinder. The engine I am going to put in is a 350 TPI. what mount should I buy to mate with the 3912597?

Thanks-

-Luke-