What holds the spacers in the block as I don't see any tabs on them. I like the idea of destroking a 360 to get a 340. It's sad that the aftermarket doesn't offer a 360 crank with a 340 stroke, when it comes to the mopar the aftermarket is lacking. How long was it before you could get a 440 crank with 400 main bearing journal size? If there was a 3.480" stroker crankshaft, you could bore a 318 0.030", use factory rods and off the shelf replacement pistons ( I think the compression height is 1.725" ) and you'd have a 340. I'm not sure about the compression height of the pistons I do remember looking them up, I believe that they are speed pros.
