Starter clicks using the key, engine starts by jumpering the relay

Couple of corrections:

[1] Post #15. This engine starts up, so not a bad engine block cable-to-bat connection.
[2] A remote starter switch. You already have one, provided by Chrys. It is the starter relay. Many GM cars had NO relay, heavy solenoid current was routed through wiring harness & ign sw direct to the sol on the starter.

You need to find out what is clicking, relay or sol on starter. Then go from there.