'67 Reassembly Questions

I'm making good progress but after being apart for 12 years I have some questions:

How far down from the top of the fender apron should the starter relay be? The replacement panel I welded in didn't have the holes pre-drilled.

What is the sqare, 4-wire plug coming out of the top of the firewall for? It is right next to the gage feed harness. I can't remember what was there and haven't been able to identify anything in my boxes of parts that would go there.

The original 289 block had 7/16" motor mount tappings. The mid 70's block I'm using now has 3/8" tappings. Can I use my old 289 motor mounts or do I have to go to a mid-70's motor mount?

I left the alternator harness attached to the alternator. I can figure out where the plug end goes into the main harness...where do the rest of them go?

I'm getting close to assembling the engine. My goal is to have it assembled, in the car, initial break in done in the next 3-4 weeks. I can then finish the rest over the winter and be ready for spring!

Rob

Thanks for getting back to me.

Windshield wiper motor...I don't have any other harnesses that fit that plug. I'll have to look again in my parts boxes...maybe I overlooked it.

The alternator has the three-wire plug that I think plugs into the main harness and two wires bugged into a common good-sized round terminal end. I'm guessing it goes on the battery side of the starter relay?

I cleaned off my work bench today in preparation of engine building...

Rob