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Re: 4.8 carb tuning help
Keep the timing at 36* all the way through the rpm range. There's no need to step it down. However, the reduced timing shouldn't be causing a fat A/F ratio. According to the info you've posted above, everything seems to be in good working order.
What's your rear gear ratio?
The secondary springs are color coded. Typically the dark to light colors indicate heavy to light. As fat as the fuel curve is, I'd start with the heaviest(black) spring and see what happens.
I actually find it odd, that a vacuum secondary carb is dumping so much raw fuel in at WOT.
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