I've never heard of there being a maximum spec, Joe, although that doesn't necessarily mean there isn't one. Even with smaller base circle cams (stock are smaller base circle than most aftermarket and I believe Gene Berg used to have some Engles ground to stock size to help clear the bigger stroker crankshafts) there's never been any concern that I know about.
Did you figure out what to do about getting minimum case to lifter head clearance?