here is a pic of sanderson headers, shorty's from ECE...although, now after purchasing them, would rather go with long tubes. I think they meet your exact specs. May be putting mine (these) up for sale soon. Brand new, havent even started the motor yet....I have more pics close up, but dont have them posted on my website. PM if you want more details.
http://www.io.com/~grzanich/71front.jpg