i used a torque wrench to torque the top oil pump bolt down to 18 ft. lbs. and it stripped out i tried tapping it and then using a longer bolt but no luck its too stripped out. could i drill it out a little larger and then use a heli-coil? or would metal shavings get behind the timing cover? any other ideas?

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.