65 SF will header fit if I go to a 440

I was planning on redoing the 383 which came with my 65 Sport Fury which I found a set of headers for already until yesterday.

I came across a 440 on Facebook locally which the guy claimed but did not know for sure that it had been recently rebuilt by the previous owner. I ended up taking the risk and buying it for $200. Come to find out it is a fresh rebuild with forged pistons.

My questions are: Since the 440 is dimension-ally bigger than the 383 will the headers fit the car? What...

65 SF will header fit if I go to a 440