Stupid drag racing question, but I'm not proud .....

Get a really good balance job on your engine and you won't have that vibration with solid motor mounts. I ran solid mounts in my old '69 340 Swinger years ago and hardly had any engine vibration at all. Or maybe I just didn't notice it because of the nasty cam I was running at the time. Anyway, it was fun and I was 30 years younger. Think I'll build another and do it again!