I've built a few of those Monogram classics series era cars and they always fit together well. Another one I'd like to do along the way is the Packard touring car, I forget the exact year but 1930ish. They had that, a boat tail and roadster as I recall. So the 41 Lincoln and the Packard are on my search list. Usually can be found here and there at ebay if you keep your eyes open. I think no matter where you look the prices are inflated, so a trade was a really good deal !!
Looks great by the way !!!