BB installation on A Body Dart?

hey i have a question..i'm putting a 440 in an Abody Demon...How much clearance is supposed to be between the fire wall and the valve covers?? I made my own solid motor mounts and i think the motor moved to the passenger side just a little when i welded the motor mounts....it has 1"3\4 roughly between fire wall and valve cover (top) on the pass. side and 2"1\4 roughly maybe closer to 2"1\2 between firewall and valve cover...will that throw the tail shaft off to much?? or will i be alright? thanks...