what is this oily f lange for?

I've picked up an engine to do a rebuild on, but on the bottom rhs of the attached photo there is an open f lange with a red gasket. What should be on here? I've not got this hole on my other engine.

1600 TP probably off a type 3



LC

 

Oil filler neck.

 

am I going to have some problems if I want to use this in a camper? and can they be overcome?
what else can I expect to be different to the standard upright beetle & van engine?

I do have a bog standard 1300 case & bottom end, so I may still be able to get a good engine made

 

vw heritage have them
i had a remtec from them for my bug and the plate was missing phoned them about it sent one out in the post next day

 

so if I blank this off, is there a place for the normal dipstick?

 

I can see some blanking plates and some are a conversion to a dipstick tube.
I'm reading there are some issues with the oil pressure switch & the oil cooler mount, that sounds about all...

 

I thought you'd just had a rebuild off LP?