I felt the opposite after running 340s for years , I went to a 360 ( crate short block) and felt like the 360 pulled better in high gear , using the same W2 heads I currently use., the 340 was 12.5 to 1 comp. with a 627 lift roller cam, my current 360 is 11 .5 to 1 comp with a 590 lift mechanical cam and it made more H.P. and torque. in the same car, same convertor and gears the 360 has gone about 3-4 tenths quicker.