What size jets do you have in the primaries and secondaries? When I tuned the Caprice on the chassis dyno I increased the secondaries jet size from 83 to 86 and it went from 15:1 to 14.5:1 and picked up almost 50rwhp. We ran out of time on the dyno but the following day we up'd them to 92 and it felt a lot stronger than it did with the 86.
You'll want to shoot for 14.7:1 at a cruise and 11.5:1 at full throttle. You need to decrease the size of the primaries to bring the cruise ratio up and increase the secondaries to bring the WOT ratio down. However, start with the secondaries first and get the WOT right then move on to fine tuning the cruise ratio.
If you want some help tuning it I'm available this Sunday.
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