Yeah, you could lose the FMU and go with 42#'s but if you do, you may want to consider a custom dyno-tuned chip in order to sort out the fuel situation under boost. Or, just go with a Speed-Pro ignition ($$$).
For now, I would keep the FMU on and keep the timing out of the motor (8 or 9 is probably as high as you want).
With ported heads and intake you should notice a difference - keep us posted on the results.
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'