904 vs 727 fit in an early A

I had the same questions about going to a 727 in my 69 barracuda. I have a 904 in it now that started making a noise when going into 2nd. (maybe just a band adjustment?) but I have a 727 sitting on the floor, Is the 727 a lot more $$ to build? I would assume just a normal rebuild on the 2 and the 727 should last behind a mild 360 longer than the 904... am I thinking wrong?