I don't think you'll be very successful in cleaning out the sludge at the bottom of your oil pan by pouring mineral spirits or kerosene down the filler tube. If you have a paint gun you can put some lacquer thinner in the gun and force it up through the hole from the outside with high air pressure. Lacquer thinner really dries oil nicely and you can get in in any home center. After some number of applications the hole should stay dry. Then put the JB weld on from the outside after you clean and roughen the metal with emory cloth. This cure has worked with my 350 chevy now for over six years.
Dave

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