If you are going for "correct" appearance, you should use a Pond or Genesis block. I had Keith Craft build a 427 SO for me. I used a cast Pond block. I am extremely happy with Keith's build and their professionalism, while dealing with them. I give Keith and his operation a big 10 out of 10!
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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
