I haven't had any luck contacting Mark Hamilton for quite sometime. His site was down for a while and was glad I saved his Tech Info for reference. But his site was back up a short time later. Who knows? I gave up on trying to purchase from him. I miss talking to him, he is very knowledgeable and very willing to help you. I hope he is o.k.
I have found a great supplier though. Their power distribution blocks are not the same as the blocks Mark furnished, but they work quite well. They have everything one might need to wire the old hot rod or your family rig. Good stuff, great prices and service.Del City
They will mail you a free catalog, I think you will like it.
Good Luck to all.......