Hi, can only say that a 276 in good shape, properly jetted & no leaks works very good, at least for me, & I like the looks of the 276. But a worn 276 is a source of all sorts of problems, f.ex. watch your float level and float needle etc, catching fire is a possibility (the magneto is directly underneath). In this context a mikuni is a security item, at a price of lost originality.
Regards
Erling