Motor Mounts

Back in the 70's I used the Ed's "For 340's Only" brand solid steel motor mounts and never felt any vibrations, just everything nice and solid which was good so as not to twist my 4 speed and clutch alignment out of shape. But they really were solid, not hollow like the Moroso brand. I would think with a blueprinted and balanced engine and drivetrain that any vibrations would be suspect, but I am no expert.