I know (Chevy) guy that built a stroker 305 (400 crank, 3.75" stroke), I kid you not. I asked him why and he said "gas mileage." Had to buy crazy $$$ dished pistons to keep the compression pump gas with the tiny chamber 305 heads. If I'm not mistaken he used some hind of "305 Torquer" World Product heads from the '80s. A good deal on those heads probably was the catalyst for the whole build. I would have just built a 307 (3.25" stroke, basically Chevy's 318).