For some steering boost without a lot of butchery, how about adding an electric power unit between the dash and the firewall? That will require modifying the worm gear shaft and the mast jacket, but it won't need anything other than replacing the steering gear to go back to original if you don't like the results.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!