Taily
All that can be said for certain is that it's a DC-4 and it hasn't had the full freighter conversion as there is no internal liner to protect the windows. Of the 8 DC-4s that served with TAA we can eliminate TAE, TAF & TAG which were delivered 64-65 as freighters. The first TAC was sold in 1948 which leaves TAA, TAB, TAC (#2) and TAD. TAD was sold in 1959 and TAA, TAB & TAC (#2) were converted to freighters in 59/60. Using your Massey Ferguson method, 1958 is probably close to the mark. Unfortunately I can't narrow it down beyond those 4 aeroplanes.
Incidentally, I thought that the green roundel was to signify that the vehicle was fitted with a spark arrestor.
Now what I really want to know, what's the serial number of the Fergy?
Rgds