I don't know squat, but I've followed this thread with great interest. The way you went about your repair was quite meticulous so that makes me think something else is wrong that's not related to workmanship or small parts. As mentioned maybe something with the crank?
Whatever it is, I hope (I know) you'll get it figured out because with all the blood, sweat and tears you've put into that thing you deserve it.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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