Not sure about margins on piston cut. Maybe Chryco can shed a little light on that. Color of engine is defintely wrong. Too much of a blue shade red. I understand some'73 340s were red, but it is an orange shade red. Most '73 engines were blue I believe. The factory intake would definitely be dual plane though. I dont think there were any single planes from the factory except maybe on pure race engines, such as the Max Wedges & Hemis. For street use, the dual plane is the best unless you are going to do most of your running, or a least a lot of it above 6000 rpm. Again, Chryco is probably more knowledgable on this than me. Any way, have fun w/ the car. Ovmf
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