Sounds like you have a pretty solid engine for 125k. Even though you've got awesome compression I'd agree w/ Rick 91GT and get the leak down test done. Even if the blower ends up killing your motor (which I don't think a 6-9psi kit will do), at least you already planned on the new one
. You'll probably want to move up to a 190 f/p or better and definately upgrade the stock injectors.
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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)