My car is a '56 Fairlane Club Sedan with 312 Y Block that's bored 0.040 over and running a mild "street" cam and Mummert intake with a C4 auto trans.  I am currently running the stock radiator, but it's struggling a bit in hot weather with the a/c I added last year.  I'm looking around to see if there's an after-market radiator that would be more efficient than my original.  If it requires some fabrication to mount, that's no problem, but if possible I would like to stick with the original appearance as much as possible, which rules out cross-flow radiators.  Has anyone already been through this with an aftermarket radiator and is happy with the cooling results?  Many thanks for any suggestions.  Ron...