I dont know about overall E.T, but the A518 will give you a better 60 foot time due to the lower gear ratio in the planetary gear set! I think the A518 has a 2.74 low gear where the 727 is either a 2.45 or 2.54...cant remember!
1968 NSS/AA "HEMI" DODGE DART
1970 "452" E-85 PLYMOUTH DUSTER
1987 "318" RAM D100
1983 "318" RAMCHARGER (408 SOON)
RACER'S FOR CHRIST CHAPLAIN
NHRA DIVISION 3
"LAND OF THE WINNERS"
....AND ON THE 8TH DAY, GOD CREATED MOPARS