Re: ProFlow ECM and Ign Amplifier.
You're more likely to pick up interference through the wiring proximity to high voltage than the actual unit which is most likely the reason for the two foot rule. Might be good to try the MSD noise filter also. I used one on a truck with MSD to help with some radio noise. Didn't work, but I think it's because the MSD is mounted in the engine bay back corner close to where the antenna runs through the fender.
My unit has the ECM connected directly to the throttle body and the main wiring harness and wideband harness come right off the back and are practially under the dizzy and coil (MSD mounted to firewall above passener valve cover). No issues with that but my engine, frame, and body are grounded to hell and back. It uses a removable cable to connect a laptop and back when I had an HEI I used to just leave the cable installed and run under the dizzy, behind the valve cover, and through the blower motor grommet in the firewall so I could run the laptop in the seat while driving. Didn't have an issue until changing out the HEI for an MSD 8360 and Blaster coil over the valve cover. Then it wouldn't keep connection. No issues with the actual ECM though.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled