Not far off getting the Mustang back on the road so I guess it's time to look at the gearing.
By all accounts (not opened it up yet) it's running 4.11 in the diff.
What's a better range to use for general street use ?
Overall it's a slightly played with 351C running through an FMX box and the...
Fed up maxin out at 45? Get rid of those 4.11's in your rear.
I have a set of matched 3.54 gears for an early 32 axle, bought in error as I have a late axle (another 3.54 set on their way).
Make an offer and get up past 45mph.