340 crank in 360

It be a cheaper way to run a forged crank for high rpms.

But after buying the spacers and likely a line hone-if not bore-not sure how much cheaper. Scat forged cranks are around $700 and plus you get more stroke.

But stroke isn't what you want for high stress-high rpm racing motors..like oval track. Street motors are far different. Those motors you don't run a 5,000+ torque converter, 13 to 1 compression and shift at 9,000 rpms.

The disadvantage is you lose some torque by running a 3.31 stroke crank instead of a 3.58..

BTW in 1970 the 340's were de-stroke to get in the 305 CI rule requirements. The racers could had sleeved the cylinders for smaller pistons and still have the 3.31 stroke but they went for using a 2.94 stroke crank to gain rpms and less stress on the cylinder walls. (bet some old timers are shaking their heads at running a 4 inch stroker crank, lol)