Estimates for 1/4 time?

According to Camcraft, specs for a stock 340 cam are 210/220 at .050. If that's accurate, your cam has six degrees duration less than a stock 340 cam. Kinda doubt that Weiand intake is any better than the stock 340 intake; but your carb is a little bit bigger. On the plus side, you do have an extra 20 cubes over a 340, and your truck is pretty light. And with the right gears and with traction, I could see a 340 A body that's stock except for headers dipping into the 13's.