Finished up installing the Holley Sniper and Dual Sync on my 440/512 Charger over the holidays. Installed the Holley EFI ready fuel tank as well. Took my time and all went well. I switched to their later -203 Dual Sync distributor as it fit MUCH better with the Indy heads than the -103. Timing control is awesome. The car starts in 38 degree weather now, and has a much stronger seat of the pants feel than the carburetor setup. It's still learning, and unfortunately I've been too busy with customer cars to go out and enjoy it more. I'm still playing with the timing control, but the small changes I have made have been quite noticeable in regards to total and initial timing. This is the second Sniper I have installed, the first one on a customers 63 SS 409 4-speed Impala. His also was a tremendous improvement. About to install the 3rd Sniper on a 73 351C Q-Code Torino next.