David: to give you an idea of how much of a problem exhaust improvement would be, see photos. Not a lot of room to move there. This is part of the appeal of not spending significantly on this motor and going for the the higher deck height of the 351 windsor block, along with most performance alloy heads having a higher exhaust port position than standard, I'm hoping I have more room to move because the bay widens out quickly as you go higher. Its almost like the bay was designed for a 351W instead of a 302W. With all this in mind I don't know that I'll be doing much on the exhaust side and that will certainly limit any improvement, possibly to just a weight saving and unleaded compatibility and I'm happy enough with that. In any case I think I'll leave the exhaust stuff until round 2 if there is one.
-Andy