727 or 904?

j par said

The mid 70s 904 I had was for lack of better terms beefier than the 68 one I have.
Also If you can rebuild a carburetor you have twice the skill needed to rebuild a 904. Almost absolutely no special tools required at all. no special skills needed, just take it apart and put it back together with the new beefier parts. Remember I'm not sure if they'll be machine work needed but I think something about a removable sprag in the back to make it easier and serviceable or last longer I'm not sure. But like said people who really know will chime in soon. If 70aarcuda chimes in listen closely would be my advice.

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The beefiest version I have seen is the late 1980,s version with lockup torque converter. They have all the best and strongest parts.
5 disc front clutch stock,4 pinion steel planetaries, reinforced low reverse drum,12 roller sprague instead of the earlier 10, triple wrap low/reverse band,2.74 low gear, thicker cast aluminum rear support, and they are a dime a dozen. Just swap in a standard pump with a little machining and a manual valve body of choice and a non lockup input shaft is all that is needed
All the good converter manufacturers make the pump necks thicker for many years now to eliminate the cracking issue.