[Tom Wesenberg]

I wouldn't be so quick to replace everything. Put a battery charger on the battery 3 to 6 amp charger, and see if the battery won't take a charge. Make sure it has electrolite covering the top of the plates, and monitor the battey. If it gets very warm stop charging and buy a new battery.

By "top of the engine", I guess you just mean the water pump. It may just need grease, but don't pump much into the rear bushing or it will wind up in the radiator and coat the tubes. It is very easy to rebuild the water pump if need be.

Don't make your own wiring harness. They are very resonable to buy one all made up, if you need one. I like to rebuild the 5 engine bolt on's, namely the water pump, generator, starter, carb, and distributor. Then you will be in good shape, if the sludge has been removed from the oil pan and new oil added.
As you work on each part, just ask here for what you can't find in a few good Model A books. Jim Mason has a good book list on his site.