You will also need a compatible distributor if you don't already have one.
PRO SERIES 2 WIRE DISTRIBUTOR | MOPAR SB 273-360 | V8 ENGINE | BLACK CAP
I also carry the sniper if you wouldn't mind giving a site sponsor a go.
EFI KITS
I have sold, installed, and supported a ton of these. Happy to help with any questions.
Don' forget the adjustable rotor also if you are doing timing control.
MSD PHASABLE ROTOR FOR PRO-SERIES BILLET DISTRIBUTORS