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Go with the 427sr/tw.
1) It is a 427 like you fender badges will indicate.
Completely streetable with no issues. SR stands for street rod. The only difference between the sr and sr/tw is the twisted wedge cam, intakes are both eddlebrock performer. The r has a different manifold and different cam, no quite as streetable. I was hooked on a 402 until everyone kept asking me what the heck is a 402, you are paying for the dart block you should get all the cubes you can out of it
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