Because I have a shortened 12 bolt chevy rear end, so matching bolt pattern up front would be nice. I do have a chevy bolt pattern up front now, but aluminum hubs with larger rotors, and aluminum calipers would be cool.
I would change that air cleaner on the hood, it looks like it was just bolted on for looks. Build a cowl hood for it, it would look real mean!
http://mpmotorsports.net/frame.html look under Hood Scoops
I've read that with the T56, when it's in 6th gear it works best with a fuel injected engine. With a carb engine there always seems to be trouble in 6th. I have fuel injection and have never had a problem in 6th gear.
One screw all the way in is a little weird, but if you got the highest vacuum that way and it's running alright, I guess you got it. Did the Idel speed go up when you adjusted the screws?