Im looking for a bigger motor to put in my truck this spring and I have 2 friends that I could get a 400 small block or a 396 big block from. I could get them for about the same price. Since theyre about the same cubic inches, what are the advantages of each motor? Which would be better for a truck? My truck is my daily driver but I use it for work and some play on the weekends, nothing too serious. My built 350 has plenty of power for what I need but I want a fresh motor. The advantage of the 400 would be that I already have a whole lot of brand new parts on my 350 that would fit on it so all I would need to do is get it bored and put together and get a cam for it then use my 350 parts for the rest.