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I would probably go with the late-model two-bolt. I prefer a roller valvetrain and I don't like retrofitting since it is really expensive. Additionally, that late-model block is a one-piece rear main seal which will be better than the old two-piece design.
You only need be concerned about using that 4-bolt block if you're going over 500 horesepower or running at sustained RPM, neither of which sound likely in your case.
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