What years of 727 for A body

Unless your building that 340 for around 500 H.P. The 904 that you currently have would actually be a way better choice. The 904 uses alot less H.P.to run. And they are a great transmission. Most people, including myself, will just use the 904 with a reverse valve body set up in it. I hope someone else jumps in here to say how good of a trans a 904 is. Do a search on here. Just recently I think the post was titled "904 or 727" Check it out. It will have all of the info to convince you otherwise. Good luck.