8 inch converter questions...

Any thoughts on switching to a 904?
Since you changing the convertor & the 727 valve body will work in the 904.
Also, the 904 isn't as prone to blow up as the 727.
You will also save about 35LBS of rotating weight plus the trans is lighter to.

My kids first hot rod was a Dart Sport street/strip car.
3.91 gear, 904 w/9.5 Dynamic convertor, 360 with KB107's OTB Eddy's, Hughes solid cam.
The car ran 11.80's with full exhaust.
The Dynamic seemed to lock up better at cruising speeds than others that I had used in the past.

I currently ran 904's in both race cars that I have, no concerns with them, just free horse-power.