HV pump will not change the readings. It only give more volume not pressure. barton uses standard pumps on the s/s hemi's.
fire it up and then see what you have.
More volume into the same restriction will increase the pressure so a HV pump will most likely increase the pressure in his engine. The only time a HV pump wouldn't increase the pressure for the OP's engine is if his current relief spring is set at 40 lbs. That seems unlikely but it could be the case. If he has a HV pump and swaps it on there I bet his pressure goes to 60+ psi.
