Might want to search for my post "Modernized Wiring ..." maybe 10 yrs ago. Mostly underhood rewiring where I installed a fuse/relay box from a 1990's Jeep, in my 1964 & 65 A's and 1965 C. Under-dash, I added a relay for ACC to take that current load off the key switch and relays for the lift motor in my convertible. If doing again, I wouldn't use the Jeep box since the terminals are unusual and the plastic fingers which secure them can snap off, so the terminal will push into the base when you press in a relay. The Jeep box has ~11 relays as I recall. Later Mopars use half-size relays so the box can be smaller for the same functions.