what can be done to lower 60ft time?

MT ET streets will help a ton. You may wind up the leaf springs though. There are several ways to address that. $250 to fill a nitrous bottle, Ouch! 100 HP squirt can take a second or more off of the ET but only after you add the traction. The bottle can't be cold or it will lose half its pressure at 10 C and you will run way rich. A bottle heater may be required. You will also have to purge before every run. Can your motor spin fast enough to get a 4.37 gear through the traps? Warning as you start running faster you start having more fun!