I am a big fan of the Holley EFI. I don't have any experience with the Infinity, but I have heard really good things. Compared to FAST, ACCEL, MS, and the older AEM boxes, I would choose the Holley.
Getting it up and running is really simple. I have run it with an LS3 reluctor wheel on the front of an old SBC, using a hall effect distributor as a cam sensor, with coil on plug, and it took all of 15min to get the software configured.
The learning feature works well, plus you can program when it learns and when it runs straight off the VE table. You can also run dual wideband sensors, so you get a reading from each bank.
It's also very easy to add different features, such as boost control, transmission control, nitrous, water meth, etc.
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