Thumper, I think this is just a mis-understanding. I did not say or mean to imply that these carbs cannot benefit from tuning. They can. I have never seen an OOTB carb that couldn't be improved, at least in the transitions.

I only suggested that there was more than one way to change the flow of the metering orifices. The OP prefers to have a carb with more of the bleeds and such already tapped. Had he have mentioned that, I would not have made the suggestion, as it would have been unnecessary.

I would like to ask one question though. Are there many popular carbs with the PVCRs and T-slots already equipped with the small jets? I have not run into any myself. And those two areas nearly always need some attention, in my experience. So, no matter how the air bleeds are, I end up needing drill bits and such for those.

I honestly meant my original suggestion as a means to help the OP, not to argue any particular point.