Not 100% sure of this, but wasn't it the L88 that was advertised as 430 hp and the tri power was 435 hp. I think I remember the L88 was a $1000. option the the 435 hp tri power was much less $. That is why so few Corvettes came with the L88. I think I remember the ZL1 being rated at 550 hp. Again, not 100% sure of these numbers, but I could do some digging in my books!
Just looked up the '69 L88 and it was advertised as 430 hp.
I have an old Muscle car mag, where they run the ultimate shootout between a '66 427 Cobra and a '69 L88 Corvette. Interesting read!
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
