Look at the e-brake setup from a mid-80's Dodge pickup. The entire front cable assembly mounts along the driver's side frame rail, and if you use the whole system, cables to the backing plates and all, it should be pretty simple to adapt. The attachment inside the backing plates to the mechanical linkage is almost identical to the Chevy, if you've got Bendix brakes.
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!