I got a good one to tell you how easy this is to get a small block in the 12's. 35+ years ago I sold my 1972 Duster to a good Friend and he asked if I would build a 340 engine for him. We took a stock 340 block and honed it, reconditioned stock rods, stock pistons out of a 1970 340, stock crank, LD340 intake, a set of 2.02 valve heads that I polished when I knew NOTHING, an 850 double pump carb, and a 484 lift purple shaft hydralic cam. He was into dirt track racing so up to this day he only had a 15 second car down the dragstrip. My Duster with him in it was app 3100 pounds. The car had a spool, 4.56 gears, 727 trans, and the thing that made this package work was a 4200-4400 stall Turbo Action convertor. He drove it some on the street and we were confident with it so knowing we only had 2 time trial gave he heck on the first pass. When he came back and saw the 12.28 ET time slip he was shaking like a leaf. Here's a picture of the car.