What I have as 'surplus' is an Autoloc KL550 which is a 5 channel unit. Here it is at Summit and at the price I paid : AutoLoc KL550 - AutoLoc 5-Function Keyless Entry Systems - Overview - SummitRacing.com

Summit also has an installation instruction posted as well

A reasonable offer WILL NOT be turned down

Solenoids - they are also available from Autoloc. You probably don't need the monster 35 pound pulls that a newer car would use; High Performance Parts & Accessories - Car Shop Inc.