torque converter question.

Went to track today and car ran great but I couldnt cut a light to save my life. I would have won two rounds in a row if I could cut a light. Seems my car isnt reacting off the line as quick as I am. I think I need a 3000 stall converter with my car. Its a 340 with a .484 purple shaft cam and .284 duration and my cars seems slow off the line . My 60 foot times are 1.95 to 1.97 and I know the car has more then that in it. I ran a 8.74 at 79.8 miles per hour . The guy I bought it from said it had a 3000 stall but I dont see it. I have 27 inch tires and 3.91 gear , what do you guys think about it being slow off the line. I think my 60 foot times could be 1.7 and run at least 8.3. Thanks guys and if you have a good used I may be interested . If not what should I buy or not buy. I wanna keep car streetable