Is there any overall difference in the length of a 6.2 diesel and a 400 small block? Reason I ask is because I have a 84 m1009 that was stripped and I put a 400 small block in it. Now I am putting a 400/208 in it which is what the truck origionally had. I am wondering if my holes for the trans/tcase cross member mounts are gonna line up or am I gonna have to drill new ones? I really dont want to drill new ones becuase I have already drilled a extra set there when I had the th350/203 in it.