Chassis & Engine Number Interpretation

[Researcher]

Gents,

This is my first post, and I admit to being pretty ignorant in the subject matter, so please forgive the elementary nature of the question.

I have a reference to a GMC 1964(?) Carryall, 4x4. It had the following engine and chassis numbers listed (below). My query is: what do these numbers 'tell' us?

Engine: 305E/30407A

Chassis: PF1463A

It was a rather special vehicle converted by Sperry-Sun systems to a 4 wheel steer for use with a Ground Elevation Meter.

Any info about the above numbers would be appreciated.

Thanks

Mike C - 'Researcher'