I would strenuously object to your rat roding or hot rodding it.
Its a pretty rare truck, your father in law kept it for a good reason,
Over on the OldGMCTruck web site you will find alot of information and support, especially for the hydro's
dont go there if your going to rat/hot rod it.
Its too rare to ruin it, better to sell it off and cobble together some junker nobody will miss.
these were some of the best trucks made, and dont be fooled by the auto trans, properly carred for they will last easily 100K
get a master parts catolog
get a service manual
get a hydromatic manual
the literature investment will be the best money you ever spent
