This is a work in progress for my NC6VHO adaptor. A few mistakes, this was for setting up a 1946 Holley 1-BBL on to a 1908 Holley intake 63 Falcon head.
It is an example of a baseline 1-bbl trial version with no modified internals. This is before the new 3.5 degree alloy top is drilled for three holes using a dyna bolted 50 mm bridge maintenance diamond tipped drill bit, and grouted up with FosRock and Devcon, then gasflowed. Lots of fun to do, I use a bridge maintenance contractor to do it. That way I can convert from three Webers back to the 1-bbl to compare performance, air fuel and emissions.
Because of the space opened up by the short E1 October 1980 on wards high mount starter, I'm working on a six O2 sensor exhast based on this version of the Argentine header. According to others like TheFrenchtown Flyer (Greg K), the 1-bbl and 2-bbl version,( including the TBI modifications) have a poor roosters tail, and it's not unheard for the air fuel ratios to swing about a full A/F ratio point from cylinders 2 & 3 and 1 & 6. So good manifold porting is really important to even A/F mix and even flow efficency to each exhast.As they say, its not what you eat that makes you thin or fat, its what comes out...