You just feel more vibration through the frame and may also experience some frame torque, but not likely with our power and weight. Rubber mounts are purely a compromise by the mfrs. to decrease felt vibration and torque. Solid mounts actually increase power transfer and if you go this route, you should do a solid trans mount as well, possibly a reinforcing solid trans mount to account for the mounting on aluminum case.
Now that you have me set up to open mouth; insert foot, perhaps another member with experience could chime in regarding solid mounts on an aluminum block and trans case and if the tapped hole should be enlarged/ helicoiled. or threadlocked or if the assemblies should be additionally strapped.