I believe you'll find the triple carb setup presents some pretty formidable clearance problems unless you modify the firewall contour, or eliminate a core support brace rod. If you choose that route, definitely go for the smallest venturi carbs you can find, and/or use a progressive linkage setup where the end carbs don't open up until nearly full-throttle is reached with the center carb. The Buick straight 8 twin-carb setup worked that way, and it was pretty reliable. I think Hudson also used a progressive linkage 2-carb system on some of their hotrod engines. With a progressive linkage you can also disable the idle system on the outboard carbs and eliminate a lot of idle synchronization headaches. The Chevy, Olds, and Pontiac TriPower 3-2BBL rigs did that, and also the Corvair Spyder engines with the 4-carb system. Good luck!
Jerry


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