Frame Options

This might seem like an odd post. I am working on a project (53 chevy truck) and I will be using an s-10 frame for the project. I plan on buying a kit from here

http://www.e-zchassisswaps.com/1947.htm

My question is this.

and will use any year long box S-10 chassis (118" W.B.)

from what I have been told I will only be able to use a single cab long bed for this purpose.

Does anyone know if other s-10's use the same frame as the single cab long bed...

Does the extended cab standard bed have the same frame?

Any blazers?

Thanks