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If the dent has not deformed any seal grooves, the only thing that you need to worry about is the balance. That will probably be fine, as street ported engines don't typically make much power over 8,000 rpm anyway.
As to the oil mod - I have never done it, and to my understanding it is intended for high rpm operation. Your street port will not be likely to operate much outside the standard rev range, so I don't know that it is necessary. As I said, I have not done it and have never had bearing trouble from overrevving (redline at 9,000).
As I said before, check tolerances on everything, the FSM is an excellent resource.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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