Traditionally there are 6 bolts holding the bellhousing to the engine. It sounds like you have not removed the bolts below the alignment pin on either side. They may be covered in gook and you might have to dig for them. If the starter is bolted to the bellhousing, I suggest removing it as well. Remember to remove the sheet metal lower dust shroud from below, it has to come off too.
I hope this link works, it is a drawing of the rear of a v8 block:
https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&docid=Mc0gaJwrdRv5lM&tbnid=2BDc_IQF5hZn_M:&ved=0CAUQjRw&url=http%3A%2F%2Fgrannys.tripod.com%2F20102b.html&ei=2zhlUoP5JsX12wWnk4HgAQ&bvm=bv.54934254,d.b2I&psig=AFQjCNEvWdiGD0RfqTP70THNZoJoo-OJ5A&ust=1382451775825346
1937 GMC T16 468 BBC th350, 4.10
1941 Dodge COE 5.9 cummins, 9 speed roadranger
1947 Diamond T COE, hercules and 4 spd, all original
1955 Chevy LCF 9.0L IH diesel AT545
1962 Corvair (Elsie)
1967 Jeepster Commando
1968 K10
1970 Chevy C50 box truck
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