273 advise needed

My 273 pan looked like it came off a small block General Lee jump car. It had quite a few dents and one little rust hole. I worked all the dents out and drilled the little rust hole back to thick metal and welded it up. Can't even tell it now! I sanded it down good and primed it after I got it fixed. I filled the sump with some el cheapo oil and let it sit to see if any oil seeped out, but it was dry as a bone.