Yeah, read Shiny's thread. The 76 came with slide carbs, the only way they wouldn't be there is if someone replaced them and there is no reason to do that unless engine work had been done to hop it up.
Your symptoms are classic of a too lean mix. As TOOLS said, you carbs will work perfectly fine with pods once jetted properly. All the carbs on the sohc 750 work fine with pods.
However, if your plan is to do an 836, then put the airbox on and leave it till you are ready, otherwise you'll be doing the jetting a second time.
Also, when you do the 836, make sure you get the head ported, otherwise you won't get nearly as much out of your build.
The ride IS the adventure. The destination is just to get gas!