Have her back together again, though I am using 4-40 screws to mount the wheel stand-offs to the base until I sort (or not) the rivets. I am so much happier with this Dupli-Color Perfect Match BGM0398 Bright Red paint (and lacquer in general). Though it is a bit brighter than the original but not by much, not that I know what it really looked like 70+ years ago.
Speaking of 4-10 screws, I replaced all the screws for the sub-bases and straps with 4-40 Machine Round Head Stainless Steel screws and matching Hex nuts. The originals aren't actually machine screws, their treads are a bit coarser. Aside from that, they seems virtually the same and help the look of the engine (as opposed the worn out / rusty ones).
Photo of my two EMPCO's together.