Solid motor mounts?

I used them back in the 1970's on my bracket racer (pictured). They were sold by Ed of "For 340's Only". I never experienced any vibration and it was good to know my clutch linkage was not being tweaked by engine torque. I would use them on all of my cars if I could. Bought a clean '85 Olds Cutlass Sierra once for a rock bottom price because the previous owner said the transmission was going out. During my test drive, the car had a terrible vibration. I bought it anyway and when I got it home I found that the transmission was fine, just one of the flimsy rubber motor mounts had given up.