Kb 399’s in a 318

I say go for it
I have a 318 at the machine shop right now getting line honed,decked and the rotating assembly balanced im using the same kb399 also to get good compression with the 360 heads.
From what i have been reading and seen from a used set i bought cheap for the eagle rods that were on them they are brittle as in make sure you have a good tune on it and use the required octane but thats the same with any piston