As far as making the car 60 ft. better and changing the starting line gear ratio does your tranny have a low ,2.77, low gear set in it now ? If not that may be the better choice to help the car Especially if it is a 904 tranny
BTW, I've seen a bunch of different race cars run out of fuel volume the last 300 ft. of the track and not know it
If your MPH is down compared to other cars at your track running the same ET maybe you have a unknown problem in the fuel system