On my old Lakewood bellhousings, I installed the welded style like these.
http://www.summitracing.com/parts/lak-15981
With the welded style, when the bellhousing is installed and the alignment is where you want it. With all fasteners installed and tight, then all you have to do is tack the weld bushings. Not enough heat to change the alignment.
Or as suggested buy a Browell. Best money I have ever spent.
Good Luck
Sean