I recently pulled the 390/ 4spd from my truck and replaced it with a low mile 400m/c6. I only did it because my 390 is in need for major rebuild and i got a good deal on this engine. When i had my 390 it was quite torquey, it was stock heads, 2bbl long tubes headers. When I drove the 400 in the bronco it wasnt as torquey but it needs a tune up carb clean and fresh gas. From what I see so far, I prefer the 390 but I found parts availability difficult or people look at you like your from outter space and ask if you have a punched out 351W.