Nope you don't need one if your bearing clearances are tight or to stock specs and your not pushing 7500-8000 rpms. The best thing I did was swap mine out this winter, car runs much better and no breathing/draining problems like I had.
If anyone is interested in a Hi-Volume pump I have one with less then 3000 miles for sale Rick91GT@onemain.com or rhawver@strouse.com
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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!
FIRST TIME OUT 12.16@111 WHEELS-UP