I am thinking of going to a 4-row radiator for my car but am unsure about measurements. What would be original - 21" or 23"? How do I measure what's in there now? Is it across or diagonal? From what point to what point to measure? FYI, my car is a '67 350/295 M/T original engine.

21 or 23 refers to the core width, so measure inside tank to inside tank

hey Erik I have 4 row radiator still in the box I going to get rid of. I decided (after I had ordered it) to go with an aluminum one. It's made for a 4 speed car so no tranny cooler. Let me know. Oh and I'm not sure what the measurements are but it's made for a small block.