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Any of the "Double-Pumpers" have center hung as well as the Holley #0-3310 which is a 750 CFM with vacuum secondaries. I believe you can also convert side hung to center hung by buying a kit, check with Jegs or Summit. Conversion won't be cheap...Im guessing around $100-150. Deen
In answer to your question, to do what you want to do, Mr Gasket makes an adapter part # 1932. It will allow you to mount a Q-jet to your stock 429 intake.