Thanks for the comments guys. The street/rat rod is a 32 Chev 5 window coupe powered by a 64 Imperial 413. Power to weight ratio is favorable. There are some space constraints and right now there is no fan shroud and I'm losing too much air under 25 mph. I hate to go to an electric fan but that might be the best solution. The Olds is a 371 with the J-2 package, (three 2 barrels), after I bought the car I noticed the extra two carbs wouldn't open up. The original vacuum linkage has been replaced with mechanical linkage I finally got it freed up and viola', with a cool sucking sound and a big puff of rusty exhaust, acceleration! But the engine is tired, oil fouling two plugs, leaking on the shop floor, time for a change.