I don't really have any good advice, but i will tell you from experience that if you use the bellhousing bolts to pull it together, you can very easily bust the bellhousing. VERY EASILY.
It may just need a lot wiggling to get everything lined up perfectly. If the crankshaft and the input-shaft aren't in perfect alignment, it won't go. It should fit really tight, but shouldn't require any force. When it gets lined up properly, it should pretty much slide together.
