carb choice and slick size

Update on this thread I got a good deal on some MT drag slicks on some 14x7 magnum 500 wheels. The slicks are 26x8.5 and I also since changed gears from 3.23 to 3.91 and I took car for a little back road spin and I could really feel the difference so I should be a bit quicker at the track but I havent been there yet. I almost got her ready but need to get a driveshaft loop. What times do you guys think it will run. Its a 69 340 .30 over with flat top piston and j heads stock. It has a air gap intake , headers flow masters with h pipe that drop by rear seat , 750 holley vacumm secondaries , 3.91 gears 26 inch slicks and car only has two front seats no other interior. Its 1/8 mile track