Ecsb 60' times

So would it be safe to say, I could pick up 3 tenths just by swapping out converters?

I'm running the 3600 3c and with the setup in my sig with 150 shot I cut a 1.64 60' but that is in a rcsb. Still stock 5.3 with just boltons, gears, homemade traction bars and right at 4000 lb race weight without me in it