Need some electrical help with my ‘68 Plymouth Valiant 100

Your getting excellent advice, AND although you should attack one issue at a time, you mentioned your intake was leaking, where? Are you sure it isn't the thermostat housing on top of the intake ( under the upper rad hose) that is leaking? It is a common issue on those motors and a easy fix, that being said it should move low on the priority list AFTER the leaking brake fluid, after the charging and before you drive it again.