70hp in my opinion is enough to get you up to highway speeds quick. Take it from someone who went from DD a Kawasaki Ninja zx6r with some get up. Then jumping into a 67 vw bug. 40hp motor with 40 years on her, and I could get to 60 just like the best of them. Even now my 68 bus with the same style motor I can get up to 55 pretty quick. Like most have said its not such a lifestyle change its an attitude change.
70 is plenty of power
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