Do you have oval or square port heads?
I had an Accel DFI Gen 7 system on my engine and currently have a Holley Commander 950 Pro. The Accel system is more sophisticated and can be run seqential injection whereas the Holley can only run in bank to bank mode. Not a bid deal really. However, one nice feature that DFI has is individual injector trim where you can modify the pulse width of each injector seperately. I could really use that because my Holley oval port manifold is showing some pretty uneven air distribution. They can both control spark with the correct distributor.
Which brings me back to the subject of manifolds. If you have oval port heads, I'd recommend the DFI manifold. The Holley oval port EFI manifold has the peanut port sized oval ports which required a LOT of grinding to match my oval port heads. This is most likely the biggest cause of the poor air distribution I'm seeing. Judging by my spark plug coloring, I'd say I have a range of 13.0 to 10.0 AFR at WOT between some of my cylinders. That's a lot. That's where the individual injector trim would be nice. You could compensate for some of that.
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