Bought a grt with 604 a month or so ago supposedly only 7 races on engine. Good oil pressure, no visable leaks when I bought it. Cranked it the first time this weekend (been trying to get tools, safety gear together), and now I have an oil leak behind the harmonic balancer. What are my options? If I pull the engine and take it to a certified engine builder will they fix leak or only do a full a rebuild? These are questions I should've asked before buying but was so anxious to get going . Also, the oil inspection bolt is on the drivers side in front of the oil line on the flat top of the oil pan correct? And it has to be checked with the engine running? Any tips for doing this without burning my arm off on the headers?