Now that Im going to be be fooling with teh Gov spring I figure that I should have some sort of red line to stay under so I don't blow the engine. Any thoughts? My tach redline is at 3000RPM but its aftermarket.

 

It will depend on the mileage of the truck clayH.

If it is well kept and still sounds fairly "tight" then you should be able to run up to 3200 RPM. Normally the upper end zone would be 3300-3400 RPM, but that is a bit high. Even at that point you really should be looking at putting in the heavier valve springs.
The main concern is that with the higher RPM you may kiss a piston with a valve, especially if you have a tight valve set and a bit of wear which when combined with high RPM can make for a nasty "kiss".
SO, stay at or under 3200 for safety.
Above all, watch your EGT's, boost, AND water temps if you plan to run at the upper end of the range, particularly the upper end of the EGT range (1200-1250*F) even though that is the upper end max safe EGT, the problem of consistant high heat can begin to permiate the casting and start to raise coolant temps. Remember that when that happens it's already on its way to being an overheat condition since the water temps will be slower to respond upward. Keep your eyes open for safety sake and make sure your coolant is in good shape.
If you tow in extremely hot climates with load then use a 60/40 mix of water/antifreeze. This will help improve the cooling capacity of the coolant since a slightly higher "weighting" of water will improve cooling. Higher antifreeze content will improve you freeze protection (as in cold weather) but lower you coolants ability to actuall "cool" the engine. Normally in cold weather your not really wanting enhanced cooling, but rather, enhanced freeze protection.

Pastor Bob...

Pastor Bob...

 

I agree with BOB. Try to keep it down but they can rev also. Having a PDR cam also helps. In neutrel, mine first hit 4100 rpm a couple of times. Almost a run away it seemed like. It just didn't rev down very fast compared to how fast I let up on the throttle. But then again, this use to be Nascar Mark's old motor so it was bred to go go go . I have since turned some of the power down due to Snow, . Mine motor does see over the 3000 rpm mark occassionly. Blows that soot right out the back nicely.