Getting a set of RS34 carbs dialed in for a 750 will be near impossible. They were made for a highly modded 750 and up. I ran a set of RS36 carbs on my highly modded 1175 cc GPZ engine with ported head a big cams. The 36'swere to big I should have run the 34's. Look for a set of Mikuni BS34 carbs their easier to find and will bolt right up. What are they asking for the 34's?
If you are dead set on after market carbs a set of CR29's would be a better choice.
I run a set of RS38's on my cammed and piped ZRX1200 and they work great on that motor.
1980 KZ650 F1
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.