John, I'm sure there were some chevy's that mounted on the right side. What I do know is that pre 69' motors used two brackets on the right side, because the heads did not have the predrilled bolt holes in them. The adjustment or top bracket that bolted into a bolt hole in the intake manifold and the bottom bracket that bolted up to the exhaust manifold. If this bracket will work, you could most likely find it at any aftermarket dealer.
good luck, hope this helped.