Stick w/ the 302...the 351 is an awesome motor, but Smokedawgs right, it'll end up being way too expensive, just for a 12 second car. Check out the set ups of us w/ 12 second cars, and see which you like, don't like and possibly mix and match
. As far as your stock 8.8 rear, it should be just fine, so go for the 3.73's now.
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'90 LX 5.0;12K original miles (no sh*&);3.55 gears; March pulleys;Edelbrock Performer Heads;BBK 1 5/8" equal length shorties;MSD 6AL ignition w/ blaster 2 coil;FMS E303 cam;Pro-M 75mm MAF;BBK 70mm TB; Eibach drag-launch spring kit;Southside welded subs;9" K&N cone filter charger;Hurst shifter;Cervini's 3" turbo hood;A/C delete; gutted cats;2 chamber Flomasters;Corbeau racing seats;FMS 30# injectors;JMS chip; Holley 190lb fp;TFS track heat Intake (12.299 @ 113 - 1.78 60')