No, sir. The 160hp version became available in the 1967 VE models, but the 145hp version remained available alongside it until the Slant-6 was replaced by the Hemi-6 for the 1970 VG models. The block is not different between the 145 and 160 versions -- just the manifolds, carburettor, air cleaner, linkage, and some other bolt-on bits. The difference between 3- and 5-plug blocks is when and where they were cast. US production of 5-plug blocks began in late 1967 for use in 1968 models. According to the R-VG factory parts cattledog, 5-plug blocks were originally installed in Australia starting with the 1969 VF models.
Well…not counting the R (oil filter on RH inner guard/fender) and S (oil filter atop water pump) models.
That's the standard LH-drive oil pump and filter configuration.
PF: Probably actually PT, engine built at Trenton Engine Plant (other option is PM, Mound Road plant)
225: Displacement
R: Regular-fuel engine
2454: Engine assembled on 16 April 1968
0814: Engine serial number for that day's production at that plant
If your car has an automatic transmission, you have to hope whoever swapped in this engine knew that when putting a '68-up engine in front of a '67-down transmission, you need a ring to take up the space between the small-nose torque converter and the large-bore crankshaft, else transmission front pump bushing and seal life will be short.