Do you have the stock heads on there? Are they ported or have they had any work done to them?
If the heads are stock, I think they were not quite as good as the E7 stock units, although they were still better than the 1986's. If that is the case, they'll be severely limiting your combo. The E303 and the performer rpm are both going to raise your powerband. With stock '85 heads, maybe mid-high 13's? It depends on how good you hook.
If you don't have any traction mods and you were spinning badly before the 3.55's and added power, you're gonna spin even worse now. Of couse adding traction to the 7.5" rear end isn't exactly the safest idea either. If you think you are going to get good traction, I'd at least think about a girdle for that rear.
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