727 vs. 904???

I agree with above comments on using the 904, the 727 use to be the way to go but it's been proven the 904 is more than sufficient and takes less power from the engine. If you were running a heavier B-body or a truck then I'd go with the 727 but the extra strength isn't needed with an A-body.

The 727 is worth more so sell it and spend the cash elsewhere.