Kevko 318/340 kick out oil pan needs trimming for clearance

Hello, I test fitted the kevko M301KO 6 quart oil pan stock location with kick outs. It’s going into a 1970 duster with my 390 stroker motor. I put a notch into the lip of the k frame and got the pan on the engine and the motor mounts bolted and tranny fitted up. It is still resting on the k frame on the passenger side. Next steps will be to trim the pan corner. Just wondering how much I should cut off. How much room do I need between the pan and k frame? 3/4” Or more? Anyone use this pan?

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