DYNO disaster ? Help

i would listen to what most of the guys here said- carb and intake swap before anything...a 3310 would do you well, and an rpm air gap will definatly help out, especially in the upper mid range without going to a single plane...as far as cams go, it seems like you have the same cam as me- it sounds radical, but thats about it lol...if you wanted to go replacing cams later id look for something with a little bit more lift, but first id try the carb and intake swap, and maybe fiddling with a new converter...im actually interested to see how this turns out for you since your combo is similar to mine (340, 280H cam, headers, holley 750hp, and if you up the manifold to an air gap like me too)...good luck! oh, and 8500 bucks is HUGE money for a stock rebuild