Was the Mopar M1 low deck tunnel ram not allowed because it is no longer in production? I don't recall the EMC rules exactly. I've compared the M1 tunnel rams to the Weiand and have always picked up power at the top end. The Weiand design uses small CSA and long runners which work pretty well on some motors, but I wouldn't think it would work very well at 700 hp. You probably could used an Indy tunnel ram too. You might have needed to neck the runners down though to mate with the Victor heads.