I tried ram air once, got big 6'' metal flex tube and routed it to an old lincoln air cleaner I had from a '64-'5, it seemed to work at speed, however...when I would come to a stop...so would most of the air coming in, so the car would occasionally stall or get rough from the richness 'by checking plugs' I tuned in for the ram air..in otherwords I originally had tuned to the rich side
I drilled holes in the base lid of the air cleaner, that helped a lil.
fwiw