<VV> Suspension question

[DON W HILTPOLD JR]

I have a question in regard to the front suspension of the rampside pickup, I'm currently building a vair that has 4 vehicles combined into 1 the front half of a 61 rampside is mounted to a shortened 84 grand prix chassis and the engine is behind the cab a 78 olds 260 V8 my question is will the stock front coils be rated enough to support the weight or will I need something more rated for the load.
Don Hiltpold