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I have a 1999 Cobra with 31k miles that I just bought, but it was driven hard and put up wet so to speak. #4 piston/rings are fried and it only has 90# compression. Would you: A. Rebuild the motor/heads B. Drop a new/remanufactured '99 long block in (I don't care about #'s matching)...

https://rsracing.com/tech-wheel.html It's a nice read/reference page.