i have just bought a space-frame chassis for a kit car and it takes sierra running gear

what i want to do is eventually run a cossie 2wd lump in it.
but for the mock up and running in i will be using a pinto lump.

will using a xr4i or 4x4 suspension be up to the job of handling a cossie lump when i am finished.

are the hubs the same for the cossie and lesser models? (i will be running wilwood brakes and big calipers anyway)

can i fit the rear axle and just upgrade the diff when needed for something that will handle the power?

are the driveshafts all the same?

when i fit the bits all the bush`s will be powerflex or similar

sorry for so many questions,i just don`t want to get a donor car for the mock up then send the chassis to be powdercoated and find cossie bits won`t fit.

thanks for your help
dave