The 59 SD aluminum tripower manifold looks the same as the iron intake I have now. Guess it saves weight. The Edelbrock P22 looks like my P65 except for the head flange/waterneck difference. That 5029 Offy looks interesting. The 5707 is probably what Im looking for. I lost my old Offy catalog but if I remember the plenum was taller and the runners were a straighter shot to the ports vs the low rise's slight uphill path. Also of interest to me is the 5756 competition dual spreadbore. I got some thermoquads I'd like to try on one of those. Thanks for your link Jon
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