Sorry to read of your plight with the seals. Case Splitting tools are going for about 42.50 on Ebay plus shipping. Parts diagram site was sent to me last week Barrettsmallengine.com go there and look for Husqvarna parts, and it will take you to a parts diagram. I'm in the same boat as you are sort of, I have never split a case before but just bought all the parts online and the tool.
Tinman on youtube has a good video of him splitting a case, not sure what model saw. I'm working on an old 55 husqvarna, it's a money pit but a learning experience project!
I would spend some time searching on you tube and keep at it with your posts here, pictures, etc...
Also I was able to find a MityVac tool for 19.99 plus 15$ shipping last week. Might be able to rent one at Autozone, not really sure. Too late now anyways. You have learned a valuable lesson and an expensive lesson as well! Maybe take a step back and take a break, aqquire parts and tools or sell it as a parts saw?
There are some really good videos on how to pressure test a chainsaw on you tube, and you can also see the MityVac with the Pressure/Vacuum knob on there, the right gauge, etc... You probably need something like that for diagnostics on your next project.
Don't beat yourself up for messing up, it happens to everyone who tries to fix something on thier own! Then they realize they should have gone to the professionals. Problem is with old chainsaws, it's really hard to find someone local who can fix a saw like yours. The 385 anyways.
I found this on Ebay, same guy I got the OEM parts for my 55. You got a different setup looks like on one side of the crankshaft than most other saws.
https://www.ebay.com/itm/1349126354...YVH3J6&hash=item1f696b7264:g:mrAAAOSwJqNluIXI
Looks like that's what you need to rebuild that case, just going by the part numbers and this parts diagram here as well for a 385:
https://www.barrettsmallengine.net/partslist/husqvarna385epa-2001-04.pdf
Also I think you need to buy a case splitter and there's lots of those out there for about 50$ .
Tough break, but I would figure on splitting that case now or selling what you got to someone who has rebuilt a bunch of those saws and might even have extra parts lying around.
I would take a step back, take a break from the saw for awhile...
Decide if you want to split the case or not, someone can fix it up right now, but if you mess it up anymore it's a boat anchor... And it's nothing to feel bad about, you put a new top end on it and it blew up again, so that's not really your fault, just bad luck is all. You didn't have a pressure tester or any experience doing all that, but lot's of these guys do and they are just telling you the cold hard facts. Not what you wanted to hear...
I've blown a Chevy 350 when it was a quart low on oil back in 1987, done a lot of stupid stuff. I rebuilt the Chevy and got it running again, with the help of my best friend who was a mechanic. Never again... I sold that truck in 88 or so...
Sorry it's not going well on the 385 but these guys are right, you have to split the case now and put in new bearings and seals. To fix the saw anyways. Or find another saw and admit defeat? I'm kind of thinking you're going to try and fix it! Hope those links help out, you can do it! If not, no one would blame you for backing out at this point.