2&1/8" tti in 73 duster

I am having trouble getting 2 1/8 step headers in my Demon with a RB/440-1. The car is getting a set of coil over LCAs to make room. I wrecked a new set of proparts to make them fit. It seems my motor plate that was for the B/B1 motor is not locating the motor the same as what Mazzolini's mount says the motor should be at.

Now what as there are 3 tubes on the proparts that need fixing. May be easier to get the TTI frame headers, or what???