best site for vin i.d., specs, etc

[srs244]

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can someone suggest (their opinion of course) the best site to find information regarding decoding old VIN i.d. number, (to determine exactly what one might have), original specs and available or original optional and standard equipment etc. i am looking specifically for information on mid to later 30's ford 1/2 ton pickups and inter-changeability of all parts from mechanical to sheet metal.

thanks