[nxtruck]

Forgot to add this to my post above. You're on the right track, as far as dropping the primary jets to clean up some of the part throttle issues, but don't forget to increase the pvcr size accordingly once you clean the rich condition up. A lot of guys will plug both pvs, make some passes to get the jetting right, reinstall the primary pv, drop the primary jetting to the point of a clean part throttle cruise and then make up the difference with the pvcr sizing. The blocks you bought should have removable pvcrs already, making that part easier.
If you have a wideband on your truck, this is a WHOLE lot easier! Also, if you don't already have a set, you may want to invest in a numbered precision drill bit set and a digital caliper. These will help when it comes to measuring orifices and modifying the metering blocks and main body.
Hope this helps.