I bought points, rotor, etc. to tune up my recently acquired 69' GMC; C15, 350/4bbl, 400 Turbo tranny. When I pulled the cap, I found it was a electronic setup. Could that be original, or did someone convert? Advance Auto could not find these parts in their system. It's a Delco Remy cap with built-in coil, with a Standard(brand) LX-301 ignition unit inside. Any help offered will be greatly appreciated.