HEI in Mopar ECU casing

not happy with how this is turning out. Its going to be hard getting the aluminum plate that the HEI module bolts on to mounted up on the firewall EXACTLY where it needs to be, good and squared up between the factory holes that the mopar box bolts to. If i dont get it right, the factory mopar box wont go right over it. The aluminum plate is just the right size that the mopar ECU box fits around it. Trailbeast, how do you build yours? May just pay you for one, any pics? I like the aluminum plate that was cut out perfect and the mopar ECU sat right on top of someone had pictured..