Has Anyone TRIED Summit Brand Carburetors?

They look 100% compatible. Maybe the Holley 4160 patent ran out? They are so modular..they are the AR's of carbs!
I may break my summit card in and find out. It'll be a while before I run it though. I need to finish the current slant build first. That's what it would be for. I got me some free interest offer to take advantage of. lol