Buying new radiator for my 68-need advice.

[ubtripn]

The truck had a 327 I think but now has a 350. I want max cooling. I can't afford the expensive rads though but I am going to get it from Napa. Should I get what they show for a 68 327 or should I get the one that they show for a 68 3/4 ton? Would it fit? Is it bigger? Would the standard rad that came with the 327 work for my 350 ok? (I would think so but who knows.) Thanks for the help. =)

Should I throw a new thrmostat too? The one in it is working well but I did not know if it is a standard thing to do.