340 or 318 turbo
This is one of my choices for a manifold not because of the air gap but because of the bosses, the versatility of head options and price.
http://item.mobileweb.ebay.com/viewitem?itemId=330869715498&cmd=VIDESC
I am not trying to sell this thing to any one just asking for opinions and if their is one you think might work better let me know.