No such thing as a carb that can't be rotated..All you need is a different block and a pulse source..Every G62 I ever made is rotated..I put a 6-32 setscrew in the original pulse hole in the cylinder so it won't leak, then put a pressure fitting in the crankcase and a Walbro #128-218 90 degree fitting in the carb rear cover to connect the crankcase fitting to the carb with a seamless molded neoprene fuel line ..Works better than the original hole, which can leak if the carb is loose....
Some chainsaws are made this way from the factory, with a fitting in the case and another in the carb..No big deal....