If I ask what power level (HP) your looking for, could you target it?
If not, how about a target time slip number like, you want a 12 second ride or a 11 second ride.
Not totally sure, I'm guessing 350-400 on the HP and maybe 12 seconds?? Sound about right?
I already have a 3:23 limited slip 489 case rear, also have a 742 3:55 open. Wouldn't be opposed to swapping out gears if needed. Also can play with tire size.