before i got the dart i had a 76 aspen r/t with a 340, 904 w/low first gear, 4.30s gears w/ a 28in tall mickey and was runnin 12 teens at 110 while driving it on the street. i think you'll be ok w/ 4.30s, you'll see improvment. it was a 9 1/2 3800 stall 60'in low 1.60s

my buddy has a set off 4.88s set up in a 742 case. i have a 741 will they swap in? do you think 4.88s will get me all the way down the track or will i run out of steam before the trap?

She'll be maxed out.. is the engine balanced?
Or if you could get a cheap set of 29's too
I saw a 742 case 4.56 sure grip in the for sale race section...375$...in the northeast

It's just to heavy of a car and not enough HP/TQ.
4.10's might get you in the 12's but say good bye
to any highway driving. I would put in a stroker
kit in that 383 (say 496) and let TQ pull you in the 12's.
Then you could run 3.23's and have a good high
way driver.

What carb are you running??
4.10 gears should pick you up 3 or more tenths.
What is your 1/8 mile MPH
two things jump out 60' is poor gear and maybe a TQ will help that a lot. but your 1/4 mph is low for 13.3?? I would think 104 or so would be more in line.
running out of fuel? But maybe a bad torque curve where you are forced to shift into third??

holley 850 dp best run
r/t .262
60' 1.909
330 5.480
1/8 8.482
mph 81.54
1000 11.107
1/4 13.358
mph 100.19

power valve front and back???

power valve front only

That is a lot of carb for a 383.I bet a 750 would pick it up a tenth or more.

I would leave the front jet 79 and use a 87 set in the rear ! try that.