Aren't the stock chambers 60cc? If they are, going to 58cc is a very minimal drop in size. Compression will only raise by a marginal amount, and I wouldn't imagine you having any problems. Going to 64cc will lower the compression ratio, but again, only by a slight margin, I would say less than half a point.
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Todd
1995 GT/T-5
Pulleys; 65 mm TB; Flowmaster cat-back; Mac off road H-pipe; FMS aluminum driveshaft; short-throw shifter; HD clutch; Cobra R's; Cobra front and wing
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