I just swapped my /6 for a 273 and the I didn't change the bars. I'll let you in week or so if there is a difference. Haven't driven it yet. But it is sitting better than it was.
I am putting in a 69 273 into my 66 Valiant vert. I am told that I will need a new center link or modify the oil pan. I am also told you can't find reproductions of a V8 center link for a 66.
Does anyone know were to find a center link for the same?