Well one thing the stiffer poly mount will do save some wear and tear on your lower motor and trans. mounts as far as being detrimental to the engine no they should'nt be,hotrodders have been using solid motor mounts for years if you do'nt mind fealing the engine vibration go for it.Chico.

i say do both

well i installed the dog bones today. it moved the motor about an inch or so forward. so far it seems to imporve the shifting of the car... also the motor hardly moves when u push on the car

so im thinking that if i get the poly motor mounts it wouldnt create what some have said about the vibration...