I GOT IT!!!!
i went to Wal-Mart and bought a bottle jack to help press down on the top of the fuel pump module. that seemed to do the trick. i then removed the bottle jack and put the lock ring on. it was still quite a bitch to get the lock ring under all 5 tabs but eventually i got it.
i was a little worried i fucked up the sending unit (it was reading 1/2 tank when i was done but i thought it was close to full). well i went and got gas and sure enough i put $14 in gas in and the gauge now reads FULL. so all seems well. my Regal GS now has a PRJ venturi style Walbro 255 fuel pump and a working gas gauge.
