That's what i was going to say but 3 or 4 guys beat me too it, Ofcourse you can mig CM, but it's not certifiable by NHRA or IHRA, the 2 main sanctioning bodys. You can stick weld it also by useing nirod. But it's not legal for certification.
Another factor comes into play also, a MS chassis cannot be certified below 7.50 no matter how many bars you put in/on the chassis.
Zip.