You'll be better off using Speed Pro H405P's in a 360 truck motor, instead of KB107's. The KB's will make too much compression for a truck motor. I built a 360 torque motor for my old D350, and used KB107's the first go around.It rattled, and I didn't hear it because of the Flowbastards....and blew it up. Burnt holes in the top of the 3rd piston back on each bank. Replaced them with H405P's and never had another problem....and no difference in power or torque. If you're hell bent on the KB107's, I've got 6 .030 pistons I'll make a real deal on! Good luck.
http://www.summitracing.com/parts/slp-h405cp