I need ideas for a replacement radiator for my ITC 510 (1973). The stock one is in great shape, but I can't keep the engine temps down.

The head just checked out OK, there may have been head gasket sealing issues at CMP last weekend. Temps before replacing the head gasket were 220 to 240 after replacement more like 210 - 220. I could run the corners but had to just drive the straights to keep the temps below 220.

Is a fully functional stock brass radiator enought?

What AL radiator fit best as a replacement?

Ideas Please - Help - I am, slow enought if I can use full throttle, without it I am just in the way.