The information is both outdated and inaccurate.
Q-jets stopped using sintered bronze fuel filters in 1967.
4-6 psi fuel pressure???. Rochester moved the hinge pin forward in 1969. The later units will EASILY take at least DOUBLE that fuel pressure with a much smaller float and the larger N/S assemblies.
Thinning throttle shafts and knife-edging throttle plates is NEVER a good idea and a complete waste of time. The primary shaft is already 5/16" and the the throttle plates are helf the thickness of most other types of carburetors and delicate as butterfly wings as-is so best to leave them alone.
I'll stop being critical there, but will say that I've been supporting Stock, Super Stock, Pure Stock and FAST class racing for decades now and have build scores of Q-jets for them. Even the smaller "750" cfm carburetors are well into the 9's in Super Stock on small block 350 Chevy builds and also have some FAST "400" Pontiac RAII and RAIV builds into the 9's with the correct carbs on them. Unlikely your street or street/strip Pontiac builds needs the Q-jet hacked up for a little more cfm to get the combo up to full potential.......IMHO......
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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