#1 the rear would bolt up fairly easily, where the problem comes in is how it tracks after it's installed...not that this test is an accurate depiction of "if or if not" your rear end is in square, it will only give you an idea. Measure from the center of the brake drum to the bottom of the rocker panel and also measure from the center of the axle to the bottom of the rear quarter panel. Compare from side to side...as I said, this is not an accurate measurement to determine tracking (as both quarters have been replaced)...just a starting point.
#2 Yes, more pictures would be helpful as far as the front filler pieces go.
Glad to hear from you again, I was thinking about you and your Nova yesterday and wondering how you where making out.