Not exacly what your asking,, but my 2 cents. ..
When I put my 351w on the dyno with the good old duraspark, the operator, with about a million years experence, was laughing at the dam thing. But whens we tried a MSD box, we lost 10HP. Never was able to get that lost HP back. AND that was the whole crurve, nice and even, down 10HP. I'll run duraspark forever, I think.
Mind you my 351w is not a 700HP 7500RPM monster either. Just 430HP@6000.
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93LXcopcarSOLD14.3@96 @ 4500ft 2.02 60ft on street tires.
my 67 ranchero NOT A 390 ANY MORE! 460! 3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250
NEW(oct20/02)14.58@95mph 2.3 60 ft
corrects to:13.86@100
66 merc comet351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver
12.3@110 @ 4000ft 1.69 60 ft
corrects to:11.69@115
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