Bad Oil Leak 4000cs

[DK]

Hi all, back again!

Couple weeks ago when I did the timing belt on my 87 4000 (stock JT) I
replaced the cam and the crank seal while I was in there. Cam seal was
no problem, no leakage afterwards. With the crank seal I managed to
damage it while installing it (along with some oil for lube). Week
later when I got replacements, the seal went in all right, but maybe
it didn't go in all the way. At the third try, I bottomed it out with
the help of a PVC adapter - but nevertheless it still leaks pretty
badly (quart per 100miles)...
Before the TB job there was a slight leak coming from around the seal,
everything else around the pan was dry. I removed the seal by
inserting two screws  and pulling/rotating it out. There is no visible
damage on the crank or oil pump housing. The other thing what I may
think could cause the problem is the gasket between the block and oil
pump. When I removed the lower TB cover, I didn't put it back on, but
even with it now it still leaks around the seal and the gasket area.
Do I have to pull the oil pan in order to replace that gasket? And if
so, do I have to mess/lower the sub frame in order to access it?

TIA,


Dave