engine identification

yes and understandably your confused as cars and engines were given different letters for assembly plants.
There is ENGINE assembly information the FW340P. The W on the engine assembly info is Windsor Ca.
Then on the oil pan rail there is CAR assembly information. If there is an 0RXXXXXX on the pan rail the 0=1970 and the R= Windsor built CAR the last 6 is the last 6 of the CARS vin.