yeah, that's... uh... to borrow some industry parlance: no buneo
sorry i can't help on the crank, the pictures aren't super clear. the best place to see it is on the front of the forward most con rod throw. though all the con rod throws will exhibit it, the main caps kind of obscure it making...
a picture would help immensely here.
however, the stock windage tray mounts to the main bolts with small 3/8's or 7/16's head bolts. no need to disturb the main bolts in that application.
the absolute first thing i always check is the oil pressure sending unit & line. when those leak the oil is somehow able to wheedle waddle its way down into the most unlikely of places.
after that, i'd dry everything real good with a liberal application of cleaning of brakes and then dust the...
more lights
more electrical at bench height
plumbed air right away instead of waiting
put the lift in right away instead of waiting
a closed off area for "dirty work" ie welding/grinding/blasting
(bigger) compressor outside
i've since done a lot of that, but i wished that i'd done it from the...
https://mymopar.com/service-manuals/
1970 plymouth service manual about 1/2 way down the page.
any of the manuals from 65~72 will have the service information on the KH 4 pots, but best to have the year you're working on, or one that's close.
no, it's two piece.
if you don't have it, go to mymopar.com and download the FSM for your car. it will have the exploded view, procedure and assembly torque specs.