The Motorsport B50 block is a good happy medium. I think an R block is alttle overkill for what you want to do. A good friend of mine has a B block in his car and it is holding 18 pounds of boost and running 10.40's@132. An R block could take you near the 7's without any second guessing.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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