360 build.

motorhome could have had an easy or a hard life depending on loads and hills
if it has the premium engine with premium valves and real exhaust seats they are hard to find check the engine codes carefully
did you do a compression check or leak down before taking the heads off? if not do it
If bores look good you can either leave well enough alone or do a minimum hone and new rings
new pistons without a bore job has been done to get the compression up
use the KB quench dome pistons especially made for LA open chamber heads

I personally do not like the chevy optimized 268h but others do, some like the stock 340 cam which is even longer and lower lift- what's with that?- long life for warranty early years and emissions later years
as with any cam duration depends on your usage and attitude, gears converter compression etc
I think 268@006 comp too long duration typical low compression 360 with stock gears and converter
check out the voodoo Lunati line but get your compression nailed down first
at least use the .028 Mr Gasket head gaskets- but you will still have no quench and have less compression than you think you do without measuring