360 Mainfold ID
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you can find stock FE 4 barrells for prolly 50 bucks, one off a 352-390-428 will work. i dont think 4 barrells existed on a 360, just the heavy duty FT361 had them. Stock 4 barrells are heavy make sure you have a friend help line it up and put extra sealer in the back where the manifold meets the block. good luck