Clearly 60ft here is your loss in ET, actually if you get your 1.7 back you'll be faster.
Are those 275 dead hooking?
You might need to leave higher, 3200rpm etc and take advantage of this tire hooking and higher rear torque gear multiplication.
https://tiresize.com/gear-ratio-calculator/
Your 3.36 on a 27" tire was the same as 3.48 vs your new 28" tire on 3.70.
What's your rpm through the traps now vs before?
Your converter is at best coupling 3".
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct @ 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10", Rock Valley SS Tank, Dual 450s, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" & Borla Pro XS 3", Alum Rad & Dual Fans, 12:1 Box, UMI Arms & Viking Berz Fr + Rear CO Shocks, Hella UP5.0 Vac Pump, 12 Bolt, 3.73, 33 Spline
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