Actually, 1974 was the last year that the real ram air system was available on the formula 400 and a small number of formula 455's. The sales code/UPC was 514/WU3 in 1974. The system is manual and has no valve's, etc. Danpaul, you can make your system fuctional by removing the hood intake plugs, and cutting outlet holes in the hood, I would suggest finding someone with an factory ram air hood and measureing the holes and positioning before doing any cutting, remember, measure twice, cut once. You will need rubber hoses that connect to the bottom of the hood via steel retaining rings held in place by screws. These rubber hoses compress and line up with the holes on the dual snorkel air cleaner housing.I hope this info helps.
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