Two things about getting old: 1) You were around when all the neat stuff was going on; 2) You have forgotten half of it! So here's my question: Were the 1957 (55 & 56 for that matter) Chevy 283 2 Four barrel manifolds cast iron or aluminum? I actually had one on a 265 that we put in a '50 Ford, and I can't remember! I could Google it but The HAMB is more fun.
265 had a 2x4 setup available also. May find this informative. http://www.jalopyjournal.com/forum/threads/any-aftermarket-4-barrel-intakes-for-265s.753240/