I just picked up a four bolt main, std. bore 400 SB block, slightly used crank, Torquer II manifold and most of the rest of the motor for $300. I have a 69 camaro with a Muncie four speed and currently a 327 under the hood. I was wondering if the 400 would be a good engine for my car. It is driven on a regular basis. I always heard that 400's are hard to keep cool, is this true. The car does get driven in stop and go traffic in 90 degree weather at times. I also plan to add an air conditioner this summer. Would this engine, slightly warmed over (small cam, intake, four barrel, maybe aluminum heads) be OK for the street or will I have to buy an aluminum radiator to keep it cool.