What relays have you added?

You are looking at a big job. IMO how a wiring job looks is just as important as how it works. You dont need large gauge wiring to control relays, 14-16 will be ok. All these wires are powering is the coil in the relay. Should solder connections, stay away from crimp on connectors. We all have seen honked up wiring projects that, it seems, got away from the guy doing the work. Got too Big for there ideas. Keep it neat and tidy. Every wire should be cut to the correct length. When done, it should look like factory wiring harness. Work on one circuit at a time, you dont need complete circuit but you need to have wiring where it needs to be. All the wiring needs to be ran together, within reason. Dont be afraid to un tape and add a new circuit if you need to. Keep relays under dash IMO. And all wiring that goes into the engine bay needs to be ran thru bulkhead connector. the hardest wiring in the early A bodies is the turn and brake light circuit. I would not touch these, leave them as is but maybe with new wires. Good luck.