Heres one we sell a ton of that comes with a removable weight for any balance.
PFS80012 - Professional Products Mopar SB 318-360 Harmonic Balancer
bunch of happy mopars out there with the above.
I 98.99% KNOW you need one. The below thread is 2 years, and 58 pages worth of what I'm preachin :) we've all been round this block many times. Not picking on you, just pointing you in the correct direction!
FiTech EFI system
Ken a few posts back can attest to this. he was one of the few...
that .2% of them work ever, and its just by chance. Mostly due to electronic noise/interference. I suggest reading the other fitech thread, as this one appears to be for tuning tips.
Don't screw up your $1500 efi system by trying to save $175 on a distributor.
As seen on the other fitech thread, for the ga-billion-zillionth time...an oem distributor is not worth farting around with, as you will have nothing but issues, become frustrated with the system, and ultimately end up buying a pro-billet anways. We have sold probably 2500-3000 of these since...