I agree with 72 Challenger, the definition of what is "streetable" is pretty subjective. Just as a point of comparison, my "other car" has a 2.5 liter six that puts out 190 HP and is one of the smoothest running engines you will find, even after over 150K miles. This is close to your 1.3 horses per CID, but if I know with a computer chip I can add 10 more HP (and putting it over the 1.3 CID Mark) and still pass smog inspections, etc. Conversely, if my '72 440 put out 1.3 HP per CID (no nitrous) I'm certain I would notice a difference in "streetability" over my current 350 net H.P. configuration. This difference may not be for the better. To me, streetability means retaining some of the car's desired driving charecteristics including having enough vacuum to use my power brakes and on those real hot days, my A/C. But I realize many serious street rodders have completely different standards. There's no right or wrong answer and that's what makes this whole question moot.
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