You need a 73ML C&L with a 38 pound tube and it should work fine and one other thing that this was tuned by Dave Dalke about 6Years ago and maybe he could help you with some fine adjustment on what you have.
I have a SCT chip with switch that has been tuned for 1991 SC with five speed.
Here's are the mods the chip is tuned for.
S-port with the late model pulley and Magnum powers inlet.
38 pound fuel injectors
C@L 73 ml maf
75 ml throttle body