High pinion 44 fluid question

I finished my high pinion 44 and have it installed. I am ready to fill it with fluid. I am running a Riddler cover with a higher fill plug. I was wondering how much differential fluid you would normally put in it if it were stock. I don't want to blow fluid out the vent by over filling it.

Thanks,
Tom

Just fill to the plug, you've rotated it for caster anyways right? Besides, Hp 44s already had a high fill plug, how much higher could the Riddler be?

Just for future information it is 2 1/2 quarts.

I have a LP 44 and I normally fill it with 2 qts of 85-140 and a 1/2 qts lucas 85-140. No issues so far.