[eschaider]

The MSD products offer a less expensive (usually) way to transition from carbs to EFI. The combination of a throttle body airvalve and injectors can simplify the transition to EFI but will also limit the adaptability to higher power levels down the road. Throttle body, return style, Speed Density systems were where Detroit started in the 80's. As technology, performance and emissions compliance loomed on the horizon the EFI systems improved in both sophistication and scalability, leaving behind their throttle body Alpha-N and Speed Density origins.