383 Accusump port

Can anyone recommend an oil port on my '68 383 block to install the hose from my Accusump? They recommend 1/2" or 3/8" NPT. I was planning to use one of the oil sensor ports on the top back but I'm not sure it meets their spec. I'd prefer not to use the oil filter adapter and the engine is dyno'd and ready to run so I don't want to drill and tap it. Thanks for your help.