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I have a 1970 with big block 402, thinking about changing out the factory quadrajet to an EFI system (Holly Sniper), or is it maybe just as good to have the quadrajet rebuilt professionaly, i have rebuilt it myself a couple times over the years? 

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Fuel injection is a really nice thing to have. Easy start up all year around and quick throttle response. I too am looking at the Sniper unit. 

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  • 2 months later...

Power output is the same. The EFI gives benefits at startup, or altitude changes, that a carb can't match. There might be a slight improvement in mileage with EFI, but it's not enough to consider. FYI

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