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tti x 2 here. An engine is just a big oven, let it breath and cool it. Plus you get better sound, extra power and better MPG, far too many reasons not to run them in my opinion. Unless you're going for a concourse correct car which in that case you probably wouldn't drive it anyway so coolness wouldn't be a factor lol.
Got headers on my 340, put 'em on in 1976. They are still performing fine. I have the receipt kicking around here somewhere, think they cost about $250. Not sure what brand they are, now I know I'll go find that receipt cuz its bugging me.