This is the Planes of Fame Air Museums' P-51A 43-6251, N4235Y while at the Cal Aero Technical Institute in Glendale. They had it from 1946 to 1953 and I assume it was flown in as the airfield, Glendale Air Terminal was still open for a time during that period. She is now in Valle AZ at the annex there...
My first guess on case 164 would be (A-36A) 42-83738 when owned by Sid Smith down in Florida...well before its' unfortunate Merlin "conversion" began. Second guess would be 43-6007, although I don't think this airplane was painted before it "went south".