Has anyone done this?? I heard that the 400 makes the motor work harder than a 350 turbo. Is this true? The reason is I have a 327 with powerglide and I want to update the tranny. 350 seems like a no brained but I got my hands on a fresh 400 with a shift kit for FREE! My uncle gave it to me! I know that the 400 is a tad bit longer bit from what I see I can just weld a plate on the tail end of the crossmember to accomadate the size difference. Please give me pros and cons and share your expertise with me! Thanks in advance!