A little different but I took my 1968 318 block and had it machined 30 over with a stroker kit.It became 390 c.i. and produced 450 h.p and 490 foot lbs trq.Why? because everyone does the 360/408,and when someone wants to look under my 68 Cuda they will see the 68/318 stamped on the block..Enjoy your project!