Ready to buy an Aluminum Radiator

I put a big block 22" 3 core B-body radiator in my 67 cuda coupe. it was not an exact fit seems the B-body was deeper and required a little manipulating of the lower skirt on the core support. I am not sure the opening of the core support will allow full face cooling for a 26" radiator. I just looked at mine and a 22 core fits the opening almost perfectly with maybe a 1/2 of frame on either side.