Do it Danny, if they are the 64-67 ChevyII exhaust manifolds they are worth twice what that old boat anchor is worth. They will work perfect on that 327.
If I'm right you only need nod your head. Those have the end flanges that are only 3/8" thick, getting hard to find.
Good move Danny..You have my vote brother.. 327 is a good motor...I am getting a lot shit over my 33 that I am fixing to do the same thing!!!21k original miles...pulling the 21 stud out and going with sbc..for the same reason cost and more power..I think sbc are great motors. Like you said can’t please everybody...