Small block cleaning??..

My thought would be take the exhaust manifolds off get some thick plastic sheeting and put it where the exhaust gasket would be and put manifolds back on. same with carb but you could use a carb spacer to hold the plastic in place. breather cap plastic over opening and heavy rubber bands. PCV leave in place baggie and rubber bands. leave spark plugs in. dip stick same as breather.
be careful in those locations.

good luck