Actually the regular RPM manifold with an oil splash sheild under it will work just as well as the 'air gap' performer if you wanted to save a few $$ and keep the heat off of the manifold runners.
My vote goes for the RPM non air gap with the iol splash shield ($12 at your local Chevy dealer).
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71 short/fleet ECE 4/6 drop, LQ4/700r4/3.42 gears
70 SS396 Chevelle 427/200-4R/3.73posi
61 Lincoln Continental, black on black
Son you are going to drive me to drinkin if you don't stop drivin that hot rod lincoln
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