273 Commando Rebuild Oil Pump Selection?

Just got the engine back in pieces from the machine shop.
The owner of the shop (Been in business since the 80's) didn't think it necessary to put a Melling high volume oil pump in the engine.
The engine is a just a stock rebuild.
Should I put a high-volume Melling oil pump in the engine or stick with just a regular Melling replacement?
Thanks