How much psi should it have
I've separated the intercooler from the seawater pump and went to a 3/4" transom p/u force feed into a sand/sea strainer into the cooler, I'm getting around 10 psi at a 3300 rpm cruise is that enough? At 2500-2600 Rpms @ 30ish I'm getting 7ish, seems the faster I went the higher the pressure goes.

what you are reporting for pressue is perfect. The objective is flow... and yes the faster you go the higher the pressure based on the force applied at the PU. If you are starting to see more than 20# install a pressure relief valve into the strainer, also call Whipple and ask them what they recomend for running pressure, also ask them what the max pressure the cooler can with stand.

That cooler can handle all the pressure you can make. I have seen them in faster cats make over 50 psi. That's not ideal, but there was no way to get rid of all the water at speed and not lose it all down low. 10 psi at cruise is perfect. You want to see around 20-25 psi at higher rpms.
Eddie

Ok, just didn't want to hurt it, fastest I I've gone with current set up is 50ish at 10-12 psi seemed to keep rising but didnt go any faster, ok I'll push it harder then

What kind of water temps are you seeing? My Whippled MAG runs super cool, like 110-120, kind of worried about that.

That's just fine. You don't want heat in the motor with a supercharger.
I ran 5 seasons with no thermostats or restrictors in my 454 MPI Mags and I ran 9 lbs of boost and the only thing I broke was drives.

My 509 with M3 Procharger doesn't run hot enough to move the needle on the gauge. I know the gauge works cause i picked up some weeds on the lwp and saw the temp rise. Think this is normal?

I'm seeing 140ish

Cool, like said above mine works (weeds) and also sometimes wont even move the needle.