Im pretty sure they are made to run at a higher fuel pressure then the ZJ Injectors. But im pretty sure to get all the bennifits that you should use the WJ injectors. Dont forget to change the O rings while you have the manifold off. . . Much easier to do now then later. I dont know weather you could get away with just replacing the fuel pressure regulator, or weather you had to replace the fuel pump. If indeed you have to change the pump, i would go ahead and do a "Swampy Bypass" (search) so you could get a higher rated pump for less then a stock type pump.
Dylan-19 and Yearning
93 Rubigrand - Sold... :'(
95 Grand Cherokee Limited - 5.2 Mall Crawler
55 Willy's M38a1 - 231v6, 33" Super Swampers, D44 Full Floater Rear, Locked Front and Rear, 5.38 Gears, Viair OBA, Bilsteen 5100 shocks, Dana 18, Turbo 350, S10 Power Steering, Tilt-wheel, Full Cage, Flat Fenders....