Try the 650Dp without the spacer (or maybe a 1 inch instead). In my limited experience I would think that the victor junior would be too big for your application and the spacer would be moving your "powerband" (so to speak) even higher up in the rev range.
As with all things, engine parts need to be matched together to work properly as a unit.
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Stock stroke 308 in full weight 1982 VH SL/E = 13.019 @ 106.68MPH
Thomas Oliver Woods 16/05/40 - 20/08/07 You will always be with me Dad
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