Hey,
There could be a number of things still attached considering you haven't mentioned what you have and haven't removed; it's such a general picture. Hopefully you've already removed the exhaust manifolds because that would definitely not allow the heads to come off; if you've removed all the head bolts and surrounding accessories they should come off.
I don't know if this will help much but you can take a look at pictures from my attempt.
http://aziz.fotopic.net/c884945.html
Good Luck
Aziz