It looks like you are really making good progress! Gotta like a guy with a white 69 Valiant....biggest difference is yours is a Signet and mine is a 100, that and the fact that yours is a lot further along!
If you need brake drums later, another place to look is under 1/2 ton D100's and D150's, those should work too. Just measure your shoes first, since there were 10X2, 10X2.5 and 11X3, and possibly others.
My valiant had the springs moved in with the MP offset shackle kit, about .75 per side. Using a Centerline Auto Drag wheel, 15X8.5, I got a 295-50-15 under mine. Not bad for a grandma car!
Steelies with dog dishes rule....nice to have more than 1 set of wheels!
I think the easiest way to rewire the engine compartment, would be to order one of the repro wiring harnesses, with the electronic ignition added, I think Year One and several other vendors have these. Unless you have plans to add MSD or a lot of other wiring mods, than it might be more cost effective to clean and rewrap yours. Just a thought, as mine isn't there yet.
Alan627b