what can be done to lower 60ft time?

ok when you pull up to the burn out box and you have a street tire drive around the water. If you go through it you just pick up water and then in the burnout you through it up in the wheel wells. Then while your waiting on the tree the water drips back down on the tire. Avoid the water box at all costs with street tires

next the burnout, with street tires you just need to spin them over to clean them off a little. A big burnout will actually hurt you as it will make the tire greasy and it will not hook as well.

There are 2 free things you can do right there. Next you need to look at weight transfer. Get the front end as light as possible. If you can relocate as much weight as possible to the rear. Ie move the battery. Look at spring clams to stiffen up the rear springs if they are wraping up on the launch. Or go with the pinion snubber like mentioned earlier. A welded rear end is not an option for an nhra event, (according to what I have read in the ruel book) but if it's ok where you are, then by all means go for it if you want. Good luck and be safe