If you need to use the delivery valves, the indication will be a roughness around 1,400 RPM up to 1,600 or so (or higher). The 160 hp trucks come with 131 dv's. Like mentioned above, find a set of 181's. I got a set cheap from Piers or Joe D. (like everything else).
Ditto on the 3K RPM kit. The 3 biggerst improvements I made were a torque convertor, injectors and the 3K RPM kit. I couldn't even tell the difference that the TST #4 plate made with the stock RPM and torque convertor.