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If you mean Sniper EFI yes, I have done many EFI conversions including my own 390. What would you like to know??
I started off with a sniper a few years back on my own car ran great for a while then the ECU starting giving me problems. On the sniper the ecu is mounted and the unit itself and it's exposed to a lot of heat which damages the ecu over time I also had the same problem on some customers cars with the sniper even with using a carb spacer to help cut down the heat transfer. I removed the sniper on my t bird almost 3 years ago and installed a holley terminator which I mounted the ecu under the dash on the passenger side. I have had no issues with it since installing it and the car runs and starts like a modern car. I do notice it uses less fuel then a carb if tuned right with more power. If you go EFI do yourself a big favor and install a in tank fuel pump they run cooler are very quiet and last longer yes it's more work but well worth it in the long run. You can also use a return less fuel system so you only have one line going to the throttle body by using a internal regulator or external going straight back in the tank. I try and convince people why a Terminator is a much better system then a sniper even though the cost is higher. Another thing I don't like about the sniper is that when you have an issue with the ecu or injectors the whole unit has to go back to holley no replacement ecu is for sale or injectors. The terminator uses GM sensors and a Dodge IAC motor and those parts can be bought easy at any parts store.
I have installed a Holley Terminator on a mild 302 .030 over bore and it runs great. Terminator will work good on a 390.
