Think ive dropped a bo**ock

Hi,ive been rebuilding my land rover 90 for the last 18months,its my first project and sort of been learning as i go,anyway im getting to the point where i can see light at the end of the tunnel,until today,i pulled it out of my pop up garageto paint the wings and bonnet in there,all went well with the painting side but i was just checking round it and noticed a small amount of oil underneathi had a crawl under it and the oil is coming from the gasket [ER1440]between the bellhousing and engine.
I put a new clutch in and replaced the rear crank oil seal along with the gasket in question,but i never put any rtv sealant on as well,and now im starting to think i should of done.or is something else causing me problems like the rear seal itself ,or could it be that i put slightly to much oil in the engine although its not been running for long periods of time but was wondering wether it could of built the oil pressure up and push the oil out of places it shouldnt,
Sorry if i sound abit clueless but ive never done anything like this before,and i didnt want to have to take the gearbox or engine out if i dont really have to thanks

gasket shouldnt need sealant ,but if its leaking its either running down from above or youve made an error

Forget to mention after i noticed it i drained some of the oil out and ran it for 5-10 mins and no oil was dripping which is weird because when i took it out the tent it was running for 2mins tops and i got a 50pence piece size oil leak,but the gasket is still very wet with oil and dont know wether it was a case of to much oil,could that cause it or am i way off track ?
thanks
Craig

a few litres extra wouldnt matter ,did you reseal ladder frame properly especially across main brg joints

when you say reseal ,do you mean with rtv?

rtv or similar

errrrrr no,i stupidly thought the gasket would take care of that,what a plonker

gasket takes care of the rear face,not the ladder frame to engine block

Gutted,oh well you live and learn,could of been worse i could of not noticed it until id finished it ,thanks for your help much appreciated