Small cam Cummins build

So this has been on going and it’s took forever to get the inframe kit, but it’s finally here, from none other than Alaska. Said to have been the closest cpl 160, to be had. Actually got it through peterbilt. Pump and nozzles are built. Timing of the cam on the gear is set and now I’m wanting the heads checked, done, rebuilt,..... . Do any specific changes need be done, when going from CPL 217 to 160? Gonna put jakes on this engine too, providing W923, still has a set and willing to part with them.

 

Any changes to the heads specifically(valves, springs,...) when going from cpl 217(290) to cpl 160(small cam 350)?

 

Heads are at a machine shop and new bolts ordered.