This is the best advice you will ever recieve on getting lower ET's
Get a stall converter ASAP. With your engine mods you should have done that long ago. If your gonna drag race why would you want to leave at an idle
Get a couple of spare rims and some 15 inch slicks to put on at the track. With your mods you should be running a 13 flat at least.
Lots of engine mods and street tires is a waste of money.
Slicks let you see your cars full potential not to mention you will run alot more consistent. Since your car is an auto if you bought slicks you wouldnt even need to mess with the suspension.
JMO,