Oil pan and pump question

I just build a 400/470 solid roller stroker and was wonder what oil pump and pan to install. Berrings are .0025 - .003. I plan to turn 6500 - 6800 Rpm and was wondering if I needed a 7qt or will the 6qt hemi pan work? I have a melling 63HV (high volume) oil pump and 6qt pan installed but will change if needed (im having 2nd thoughts due to RPM potential). Also will I have any ground clearance with the 7qt pan to lower the duster? I have a 73 K-member installed. Does the K-member need to be opened?

Thanks...