Lotsa folks pay big money for a truck arm suspension. Truck arm suspension fits reasonably well into other year Chevy truck frames like
this project and
this one. Truck arm suspension can be robbed from 62-72 trucks found in wrecking yards. Truck arm suspension kits are available from aftermarket vendors such as
Chris Alston's Chassis Works,
Hotrods To Hell,
Speedway Motors,and
CPP. Truck arm suspension has been installed and / or modified by a number of folks here on the forum and they seem generally willing to help with questions.