That is a 1950ish Mercury KE7 10+hp.. Looks complete. The cowls, on ebay, are almost worth what he is asking for pair of motors. The 7.5 KE4 or Mark 7 would have the exhaust manifold coming out of bottom of cowl. A KG4 has the rockets embossed in tank trim ring. The other thing is stubby KE7 exhaust snout an cavitation plate and KE7 style gas cap. If it were a KG4, that would be a bargain, not likely.
The other motor looks like a common Johnson 9.8hp KD-15. Note, transom clam assembly is missing.