need a little help.
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The only V8 factory installed in 1968/76 F100/250 4WD's was the 360 2V.
The engine code is the 4th digit of the VIN.
1968/74 F100/250 4WD available engines: A = 240 1V I-6 / B = 300 1V I-6 / Y = 360 2V.
1975/76 F100/250 4WD available engines: B = 300 1V I-6 / Y = 360 2V.
1977/79 F100/250 4WD & 1979 F350 4WD available engines: B = 300 1V I-6 / H = 351M 2V / S = 400 2V.
390's were not installed in 4WD's, and there were no 460 4WD's available until 1983, and then only in F350's. Ditto a manual transmission, all 1968/82 460's were only available with C6's.
(sigh) LMC's VIN decoders aren't worth two cents, have a gazillion errors and omissions. If you want your VIN, all the codes found on the Warranty Plate decoded properly, post them here.