just because you cant feel it doesnt mean its not happening and not affecting you. right?? and like i said, the crappy frame w/o bracing is probably flexing more. then there is always the twisting forks is ok theory. if you go to computrack, they will tell you not to use fork braces on vintage bikes alot of the time. when i pull the front end off, i'll weigh them. unless you have each set kicking around. the 750 clamps are way more minumal than the 550/500. but the slider lenght could make up for that difference. they are probably the same withing a few grams. as you know, the honda bearings are not a typical off the shelf bearing shop item. they are freakish in size but pro-flo.com has a cross reference chart. the nice thing is that the 350/500/and 550 bearings are all the same. alot of the 750 bearings are the same, but not all.
the length of the stems is different though so either you'll need a spacer or you'll have to put the 350 stem in the other clamp and have it welded. then you can use the 350 bearing. that way you eliminate the chance of getting the wrong 750 bearing. unless you know for sure.
if you go to the 350mods forum, you'll see all of the stuff you'll have to do to get it all to go. im not going to explain it all again.
aaron, why do you think the 550/500 trees are better. and when you say trees, you mean front end right?? not just the tubes. i havent had a chance to open mine up and check the length, valving etc...but i know chris uses the 750 trees and so do alot of other fast guys. and there is a difference between the years for offset. the 78/79 are the ones that have the optimal geometry for race. did you notice what buff was running?? i didnt.
if i rake mine anymore, you'll start telling me to keep that fender i have!