no, the 360 came out in 71, so it has always been in the 70-UP group.
This group has the aluminum WPs. They come in two OEM flavors, a 6 vane and and 8vane. If you start hopping up your 360 you will soon find out that neither of these will do the job. But more importantly,neither will that early radiator.
So, in the long run that early rad will probably have to go.
IMO, you might as well bite the bullet and do it now. Any 70 and up rad will do the job. Whether or not it will bolt in I cannot say.
When your 70UP pump fails, a new one is right around the corner. When your old iron pump fails 500 miles from home,where are you gonna find a pump? You may be sleeping in a tent for two days while, a replacement comes from who-knows-where.
Just saying........
