I am working on a 84 C30 that had a GM Crate engine put in it. The heads are 882 and only have the 6 hole exhaust stud config. The exhaust manifold on the passenger side has a 7 hole stud config. The people that put the engine in just never bolted the last stud. Both manifolds are over the sparkplug manifolds. The block only appears to have a left hand dip stick so the left manifold blocks the dipstick hole. I ordered below the sparkplug manifolds for a 79 C30 since they had the correct 6 hole stud config and would work on left side dipsticks. However when I went to mount them up, the motor mounts are totally in the way, not by a little.. but by a lot. So I am baffled here.. the motor mounts have not changed between 79 and 84 so what am I missing? I am in Cali so I changing the exhaust beyond OEM will result in a failure.