The valves you have should be capable of quite a bit of power. I would recommend tuning the pump more, and getting some injectors before even considering DV's. With those mods, you will save a lot of money, and have huge increases in power. With more control over smoke and EGT's.
Sean

 

i actually got some 370 marine injectors now, so would delivery valves be a good upgrade to make next??

 

What kind of turbo do you have?

 

not needed the 181's should be just fine