I have a 70 Cutlass supreme, factory 350, automatic with 4 barrel and air conditioning. Looking to see what size radiator I should get- 3 or 4 core that will bolt on with no issues. Not sure what size it originally had.

 

Since it’s a small block car, at best it might have had a3 core. If you get the correct mounting pads and insulators, along with the correct top plate, a 4 core is a easy swap. I think the mounting pads are available aftermarket, I cut mine out of a big car years ago.

 

Thanks I appreciate it