What do you think about a sleeved block? I'm about to sleeve a 400 back to standard for my '35 Chevrolet. I'd like to have a 400 to get away from the sea of 350's at the show so I picked up a few 400's and every one I come across has been already bored or need to be at least. .030 over. So I picke up 8 sleeves and I'm going to bore one back to standard. A lot of people don't like to go past .030 because of heat issues, but I'm not sure if sleeves affect the temperature or not. I can either go standard or go ahead with .030 while i'm boreing and buying pistons and make it a 406. I'd rather go with the 406 but I've got the chance to go standard and my major concern is heat. Give me you r thoughts please...Thanks