Well, special tools really help. However, I changed my first pump without 'em.
I don't remember exactly how I did it, but I removed the clips with a set of needlenose and a couple of screwdrivers.
Just take it easy, slow, and don't break anything.
Sorry this doesn't help much, but I know it can be done.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT