If I'm understanding your numbers correctly, I'd call that 2.7 negative, and if you have adjustable uppers, a good starting point. Especially if the bars your talking about are "lift bars". I think by most accounts your engine power is on the high side to be using those if that's what they are. Do the instant center and antisquat calculations before you decide they "need" some angle.
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'65 Tempest 467 3650# 11.30@120.31
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