Not that I believe much of anything coming out of TBI Chips verbiage, I ran one for a while, I think he's saying you'll need more flow than a "stock" TB can handle. If you wanna rev it up to 5400 RPM (2200-5400 cam as advertised by Elgin) you'll need a bored out TB or even go to a 50mm one from a 7.4L and bore the intake to accept it. I have a 46mm TB (650 CFM advertised) with the Edelbrock 3704 intake bored to 48mm running an 18 LB spring set @20 PSI.
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TCI calculator table for 350 CI up to 6000 RPM
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The "stock" distributor will work fine, with tuning both fuel and spark tables. YMMV