Low gear set 904, pro’s and Con’s

In my opinion, I don't see how the 2.74 wouldn't help the car. I do agree with your converter being on the tight side. Not that I know all the specs of your car, but with 6500 shift point, going 10.68 at just under 125 at 3350 lbs, I would say if you could get it loosened up 400 rpm, I bet it would help it in general, even if you stuck with the current ratio. I could give multiple examples of the 2.74 gear helping cars that run mid 10s and weigh similar to you. Most recently, we put one in my Uncle's 71 Roadrunner and car went from 1.45 average 60' to a 1.38 60' and carried the ET all the way down the track. Prior to the 2.74 I believe his best was a 10.60 (Maybe a 10.59 or 10.58 but can't remember), and after going to the 2.74 he went 10.48 @ 126MPH. That is with an old school .650 flat tappet camshaft, 6200 shift point, 5800 stall converter, 13x31 tire, and 4.88 gears. Only A-body I know we put one in was a friends 70 Duster with an iron headed small block, hydraulic roller cam, 9" tire, 3310lbs, and it woke the car up big time on the launch. I know that there are a ton of different combos out there and finding what works for you may not work for everyone else, but if you feel the 60' is lazy, I would try the 2.74 and/or loosen the converter. If you are not afraid to do the work, maybe do the two in increments to get good data on what each change did to the ET. If it were me, I would probably try the converter first since you already feel it is too tight. Who's converter is it? 8" or 9"?

As far as starting line ratios go, my starting line ratio in my demon is 10.40 with a 2.28 first gear, 14x32 slick, 4.56 gear. Car weighs 2835lbs. I have been 1.18 60' and very rarely have an issue hooking up. My dad's Roadrunner has a starting line ratio of 11.17 with a 2.45 first gear, 11.5/29.5w slick, 4.56 gear and has been 1.26 60'. Car weighs 3365lbs, and almost never has an issue hooking up. Like someone else said above, if you give it more starting line ratio and start battling traction, tuning the suspension will be key to get the car to hook up.

convertor flashes 4900
shift car at 6500 both times
been 10.68@ just under 125
vert is tight, very little big end slip