727 in a 65 valiant

So I've a 1965 valiant and haven't seen to many with the 727 in them. My question is will it fit or would i rather be better to find a 904. It's going to be street strip car with a 408 on nitrous. And will have headers and I know space is limited. It also needs floor boards so their is a option to give it a little more room with opening up the tunnel if needed. So what are my best options here will it fit a and be fine?? Or look for a 904 to replace ??