1968 c20 motor mount issues

[Hug E Bear]

I have a 1965 c10 long bed sitting on a 1968 c20 chassis. I'm dropping in a 350 from a 1995 1500. I went to drop the motor in today and ran across a problem. The bottom of the exhaust manifolds hit the frame before the bolt holes line up for the mounts themselves. I'm trying to find out if I'm missing something from the existing mounts or if I have to order new mounts. Any help is greatly appreciated.