Can't get Pro Parts headers to fit.

Is your engine in the correct location? I have plenty of clearance on mine, although they are older actual pro parts headers, not the TTI remakes. I'm using a DC spool mount K-member with factory B/C body motor mounts.

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I notice that you've cut the inner fender away from over the shock tower, leaving the tower exposed. The OP could certainly do that also. I.e., see my post #4 above.