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SPF built some 460 headers a few years back with the flanges an backwards. That caused restricted exhaust and premature leaks. Look at your header flanges, gaskets, or heads, notice that the bolt holes are not the same distance from the pipe on each cyl's exhaust. The bolt hole on the left of each pipe is further away than the bolt hole on the right side of each pipe.(or is it the other way?) Make sure your header flanges are correct in this aspect, as well as your gaskets orientation between them. If you use the paper/foil header gaskets, you will leak. I like the blue Fel-Pro ones. After a heat cycle or two, retighten your header bolts. You will need to do this a couple of times until they take a "set".
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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