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Howdy:
I'm getting ready to install one of those Edelbrock carbs myself, in this case a 1405 (600 cfm) that I bought used. Going on a low compression 350 with ram's horn exhaust manifolds.
My past experience with QJets has been good, but all on stock engines, where the carb was factory tuned to work well with that specific combination. The "vacuum cleaner" sound from under the hood when the accelerator was floored,and the T400 kicked down into passing gear was something to hear.
When I switched ( being young and ill informed at the time, LOL) to a Holley
650 spread bore with mechanical secondaries ( 'cause it was listed as a direct "QJET replacement" that would fit the stock intake), it , of course, bogged when suddenly fed too much air. The other part of the problem was that I had not made a required adjustment of the T400 kickdown switch to suit the throttle position of the different carb. Fixing THAT helped regain the boot in the pants, which was, of course, from the trans kicking down into passing gear.
Just a few things to consider. I have found that the 1405 I have has been tuned to give a richer mixture than my mild engine needs; it will be jetted back to where Edelbrock had it as a starting point. The 600 cfm size is probably more than this engine will use, but, the "Air Valve Secondary" system is a good one, and will not give more than the engine demands(up to the flow capacity of the carb);the Qjet uses a variation of this design, as did other Rochester 4bbls, and of course the Carter AFB carbs,(though the Carter ThermoQuad had the Air Valve above the secondary discharge nozzles, more like the QJet does) which the Edelbrock's are a redesign of.
Just my $.02 (maybe $.03!).
Humbly,
cowboy33713
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