Thanks for the feedback -
Panic - every gear (except OD) runs out around 4100 rpm or so, it will rev higher, but I am definitely on the downhill side of the torque curve. Not sure what ICL means. Total advance . . . I cant remember exactly, I did check it and it seemed like it was around 37 or 39 degrees and all in around 2000 - 2300 rpm, it has been a few months since I checked and my memory isn't that great. Same story with the venturies - they are 2 sizes smaller than a stock 270 Zenith but I don't remember the size off the top of my head.
I did start with 0.030" gap on the plugs and then increased to 0.040 and then to 0.045 - each time I increased I got a little bit better starting / idle / acceleration so I left them at 0.045"
I have a stock head from a '57 270 engine - casting number 2194819
I have a small cap HEI that is set up for this motor and I am planning on giving it a shot in a few weeks -
I tried hard to keep this truck like you would see it in the '50s as far as speed equipment goes (including keeping the 6V) - I was hoping to see if carburetion would extend the power curve just a little more. I am running a 3.73 rear-end ratio with an A833 GM variant with 0.73 OD for forth gear. After all this work, I just want to make sure I am getting every pony I can out of it.
Tim - it has a stock lifter cover on it - I borrowed a friends Nicson side cover (chevy) to see if I could copy the style and morph it into a GMC version (making a mold for casting) - but time is always in short supply and I haven't made the progress that i would have liked by now.
