How much difference will it make?

Just saying:
My car is a lot like yours (OP), and I have it set up for street.
My car also 60fts in the 2.2 to 2.4 range, a lot like yours.
But she goes 93 in the Eighth. Which I'm very happy with.
So I know that my ET could be lower, if I made a few changes, but am unwilling to give up it's awesome street manners, so, I forced myself to accept the slower ET.
Since I only ever tracked this combo the one time, I feel I made the right decision.
For me, just knowing there is a half-second or so, yet to be had right in the 60ft; is enough.