Honestly there is nothing wrong with that older style carb. It's still a Nova carb and is still much better than a carb you will find on most other engines out there IMO. Yes the idle screw is on the other side of the carb but in all honesty you should not be adjusting that needle very often if ever once you have a good tune on the engine. I race on tracks that range from 3,500 feet elevation to 6,500 feet and even from one extreme to the other I don't ever have to mess with my idle. The fuel mixture will need adjusted to compensate for the altitude changes but not the idle.