If you use the stock exhaust manifold you will need them from a 1970. The driver's side on a 71-73 points down at an angle where the 70 points almost straight back. Don't know if there would be a steering box issue or not.
Thanks for all the replies. Another question, will my AC compressor still fit? Here is my current 289;
This 351c is supposedly a long block. Here it is;
Basically I am trying to gather all the facts, and parts if any I need when I try and do the swap. I dont want to get going and find out I need something and have to wait and order it.
edit, forgot to mention he has headers and pipes too that go with it. However, it was made for an old truck street rod so probably wont fit. The story goes, a guy built it for his hot rod truck, died. His nephew got it. The crank turns but has never seen it run. So I am going to check it out, and see if its the real deal or not.