I have 4.56's and 10.5W-31's w/ 727 auto.

I shift such that it goes into second at 7,300 rpm and into 3rd at 7,600 rpm and it traps as high as 8,100 rpm.

Peak power on Dyno was at 7,200 rpm.

If i wind it higher in first say to 7,800 rpm before the shift actually happens, I lose .05 easy...

I would keep the bigger tire and go with the 4.88's first. All the ET has happened by 1,000 feet IMO.

Good luck with it!