I am a newcomer to the FE world. I am driving at present a '49 F1 Ford pickup streetrod; powered by a Chevy engine. It has been my daily driver for 4 years now. I am trying to remedy the Chevy power situation. I have acquired a 428 that was originally in a '66 Mercury Comet/Cyclone. The car was rolled back in 1969 and totalled. The engine has been in storage and is not locked up amazingly enuf. The oil filter, fuel pump/filter, intake, oil pan and valve covers are still sealed and it has been guaranteed to be a virgin piece of steel.
I found the aluminum engine tag under the coil bracket and can not decipher some of the data it contains.
The top line of data is: 428 66 1 (with the circled Ford insignia next to the 1)
The bottom line of data is: 5 J 403 S

The "428" & the "66" is readily decipherable.
The "1" designator in the top line would seem to be an engine modification series notation; but I can't get any info on what it really means.

The "5 J" is the year and month the engine was produced; September 1965.
The "403 S" designators has me completely baffled. I have been on the NET for 5 hours and have not come up with the correct search to get a clue.
I would be forever gratefull if someone could educate me as to precisely what I have. I can't really build the engine correctly if I don't have it properly identified.
Thanks a million for the consideration.

Dwain Cleveland
Loganville, Ga.
770-617-9438 < Cell #