We have a '64 Impala with a stock LS1 in the shop today for an MSD Atomic EFI installation to replace the factory fuel injection - best "before" pull netted 319 horsepower to the wheels. The car is a little reluctant to start and run with the OEM calibration, so it will be interesting to see whether the MSD system helps drivability as well as power.
![](https://i.ytimg.com/vi/Q0Dfi_1Tmgo/maxresdefault.jpg)