Downflow VS Crossflow Radiators

Hi everybody:

I'm thinking of getting a crossflow radiator next year. I was told they're more efficient than the regular downflow type. Are they any better? I've looked and looked but I can't find any A-Bodies with any crossflows so maybe that is saying something.

I have a 28x19 crossflow in my 68 fastback, but cant answer ur question , but am interested .