I've been pondering this one for a few minutes now. You have fuel, check! you have spark, check! it's timed okay because it DOES run, Check!. Only other thing I can think is something mechanical in the valvetrain. What is baffling is that you have compression. At this point I would pull the valve cover and measure lift. I suspect you have a valve (or two) on cylinder #8 that is/are not moving open the correct amount. I would also check valve / tappet adjustment while it's open. I'll keep pondering this poser.
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Steve - CTCI # 37081
1955 Tee-bird modified, 88 Reatta, MOPAR11 #735
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