489 vs. 741

I've got A 741 going in my car ,isn't it still a good up grade from 8 1/4 ,or should I keep the 8 1/4?
With no other information to your question.....
Depends on how much power your putting to it.

One can argue any up grade is a worthy up grade but where does it end?
You’ll also have some *** clown or two hear you say you upgraded from an 8-1/4 to the 8-3/4, *** clown 1 says;
“That was stupid because your not making a lot of power!”
while *** clown 2 will say;
“Why did t you do the DANA & be done with it? What a waste of money!”

Sorry the bottom line is do what makes you happy or feel safer.