I already got the big one done as I just got my new R3/ Indy head 408 , thrashed to get it ready for yesterday ( last test and tune of the season ) and found out what I already knew that the 4.88s are way to much gear the 408. With 50 more lbs of torque than my 363 it needs less gear so I have to put my 4.10s in. The 363 didn`t like them but they will be great for the 408.
I think you will like the 4:10 gears. We installed my old 408 in my Sons 3100 pound duster for this years Halloween Classic and it ran a 6.40 ET. I wanted him to take it to PRP the following week to see what it would run in the 1/4 but he didn't want to go. 727 transmission (foot braked) 5500 stall. He went from 4,30's to 4.10's last time he switched gears.
