Just remove the upper plenum and get the tamper proof bits Al mentioned. To relieve the pressure in the fuel system remove the gas cap and either hook a pressure gauge up to the fuel rail or depress the schrader valve until the pressure is all gone.
And instead of asking every minor question try searching Thirdgen.org for your answers....you'll probably have them faster. Sometimes it's better to do your own research and sit back and listen than to keep asking questions.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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