Carburetors for STR-12 Manifold

The whole point of the STR manifolds was to get the runner length of a tunnel ram, under the hood (STR = Street Tunnel Ram) In my Dart I couldn't put any carb spacer in and it was a struggle to find an air cleaner with enough perimeter length to use a filter element that was only about an inch tall and still have enough filter surface. That blow off plate that goes under the carb wouldn't fit for sure! There's plenty of room for the spring loaded nitrous plates, though...