What pulleys or radiator 68 dart

I have the same thing, a 75 360 in a 69 barracuda. The best thing is to stay with one complete front engine setup. Either use all the stuff from the 68 setup, or all the stuff from the 75 setup. You can improvise a bottom radiator hose to fit on either side if you need to.

The post 1970 stuff is much easier to find. Do you have power steering or ac? Post some pictures.

My engine had a 3 groove crank pulley so that gave me a few more options.