Sorry, never had it on the Dyno but I'm pretty sure it dies well before 5500 rpm.
You didn't list that you have a 75mm TB. I think that is probably too big for what you have. Even so, the 77mm MAF meter is too small for that throttle body size. You should probably have an 83-87mm MAF meter.
As for the Victor intake, I thought it was pretty expensive and is really designed for a high reving engine (4000-8000rpm powerband). The Trick Flow stuff is less expensive and a better match for your setup. They also flow great out of the box. If you want to go with Edelbrock, the Performer RPM is probably a better match.
The Trick Flow R-series is probably the best match because of the 347.
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351W 89 Mustang GT Convertible