i really think you do need to water heat the intake. when my car ran the 292 with a carb ( in the summer) the intake gets very cold and would frost in cooler weather w/o heating intake. once i heated it the car ran better. the fuel will puddle in the intake and give poor performance when you get into the throttle. the pooled fuel is sucked up , giving a very rich condition ( bogging). maybe this is a condition more common with humid areas or cars that are actually driven regularly.
you can certainly do a search for heated intake on the board here. plenty discussed about it.
