Radiator and Driveline help

So I just realized as I was getting ready to order my Schumaker engine kit that they are six miles from my house. LOL I am going to just go pick them up.

Two last things I am missing are a radiator and driveline.

Can anyone tell me what the best donor cars or parts are for this? I am putting a 1978 440 in my 68 Valiant. I am assuming my Current slant six radiator and 904 driveline will not work.

Also Will the exhaust mahifolds and Oil Pan off a 68 C-body 383 fit in my Valiant on this motor??

Thanks