What gain will I see in my time slips

The 7.71 1/8 converts to a 12.10 quarter.
That says the front 1/2 is at least as good as the back 1/2.

It’s either missing.......or wasting.......80hp.
Or he’s letting off too soon.

my 6.78 front converts to 10.61,only been 10.77 thus far, and i am not lifting anywhere.
His front is actually closer, he went low 12.20 in 1/4
I am looking more at the mph. 87/107 is very low for a stroker motor with decent heads.
I still suspect a good 5k ish flash vert would pick it up everywhere.
Be curious what his trap rpm is. If its 6400 or so, with a 26 tire and 3.91’s its loose..at 107 mph….

my little brother has a stock 340 shortblock in a 71 unlightened Dart
Been 12.70’s with 2.02 J heads, mid 240’s generic Comp flat tappet cam and typical bolt ons. 10 inch soggy 3200 flash vert. 4.10 gear, short tire.
He just swapped on Eddies, same cam as i have, and is getting an 8 inch vert i specced for his combo built for it as we speak.
I told him to expect at least a whole second gain. We will soon find out.