I'm at 24-25psi boost and 7500 RPM. I use the Holley HP with TFI distributor and it is fine. I have a CD ignition and MSD coil. It never skips a beat.
My RPM does not wind up fast enough to cause a timing index issue with the 8 point sample in the distributor. Engine basically parks at 6500 on the converter after a 5200 launch, and winds to 7500 or so with the glide. I'm eventually going to do a crank trigger, but for now it is not an issue.
The only issue I had with the Holley was a ground loop caused by Holley doing the chassis ground in the EEC common with the battery ground. When I grounded per Holley instructions using Holley harnesses, it was a mess about 6k. After I cut the Holley power ground off the battery and grounded to the chassis near where the head grounds, it all got perfect.
I tried a FAST dizzy, but the .467 shaft was .463 to .464 on about 5 distributors I measured. I could not buy a gear that fit, so I just kept the Ford OEM dizzy and returned the FAST.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)