I have a '49 Chevy Truck with a basically stock 350/350 engine trans combo with a Camero rear end. I've been running a Edelbrock Torker manifold with a Holley 600 carb with an eclectic choke. This is my daily driver and 99% of my driving is on surface streets under 50 mph. I've read that cooler fuel is denser and gives more top end power but I've also read that warmer more vaporized fuel gives more bottom end power. Is any of this true? I'm switching over to an Edelbrock Performer manifold this weekend. I'm wondering: Do I want to block off the exhaust port that would normally go the choke, or do I want to leave it open to heat the manifold? Like I said, I don't normally go over 50-55 but I like to get there in a hurry.