Mopar engineers design the long cross rams in 1958. in 1961 they shorten the runners up and increased the intake and exhaust port sizes to make the Max Wedge package that had the shorter intake runners and a lot bigger plenum area under the carbs.
I'm not sure when and who came out with the tunnel ram intakes which ended upmaking the cross rams intakes obsolete
I wasn't overly impress with the Eddy STR intake on that 383 motor at the time we used it and now after owning and driving several different cars with stock M.W motor and then later owning and driving a hemi cross ram motor in a drag car I can say there are far better parts than the Eddy STR intakes