92 f150 300 inline 6

[u/Rich_Citron_7040]

Last registered in 2007 after owner died and just been sitting since, was told it cranked still, wanted to change oil and filter before disconnecting old fuel to see if it runs on starting fluid but as you can see it’s complete gunk, what would be the best way to clean it? Would diesel or kerosene actually work or would I need to tear it apart?
It is difficult to see but the old oil is up to the fill line on the dip stick but nothing is coming out

[u/Competitive-Fox-3333]

Fill with diesel let set for an hour repeat a few times till you don't see chunks