Proper Radiator

I believe you have 70 up front cover and waterpump. I would go with a 70 rad setup as changing to 69 requires a bunch of other changes (timing mark on balancer, add on timing tab on passenger side etc. water pump with outlet on drivers side, alternator bracketry IIRC)

I hope smarter people will chime in here but that is what I have gleaned from looking at parts, and my memory. Plus you get the advantage of an early form of cross flow radiator (in on the left, out on the right)

1969 rad
upload_2019-6-22_11-39-43.png

1970 Rad
upload_2019-6-22_11-42-7.png

up to 69 WP

upload_2019-6-22_11-45-29.png

70 up WP

70 wp.JPG