POLYLOC MOTOR MOUNTS
I've tried the unbreakable bolt through rubber isolators, and they failed. Welded up a stock set of rubber isolators and they did not fail, but tingled a little bit through the floor pans and steering wheel.
I finally got tired of the solid mounts and fabbed up my own heim jointed torque strap,with urethane bushings as isolators for a fraction of the cost of poly locs or a pre-fabbed torque strap and I can preload it with the heim joint.
No more tingles, and the car seem much less "nervous" and yes I drive like a jack *** with a 4 speed, and I put about 15k miles per year on it.