What I was saying , MOST on here think your bike has to have stock airbox , stock carbs , stock forks, stock gauges, you get the idea.
Yes I can agree SOME CB750s in ORIGINAL condition are worth serious money but the percentage of them have had so many parts replaced on them since 1969, that the ONLY thing original is the frame and even that, if it has had upgrades added,ie,frame rail kits and roller bearings in the neck, then it is no longer original only improved.
I know you can tune carbs for the type of air filters and exhaust, but it is sometimes trial and error. Most newbies don't understand , if you change exhaust( more air OUT) then you need to change carb jets for more air/fuel in!!
Oh by the way Inkscars: glad you got your bike in tune!!
Xnavylfr(CHUCK)