Brenden Westbrook

I just got a 94 suburban. 4wd 350. The exhaust fell off at the stock collector. So I ordered headers and all the rest of the good stuff from summit. I was pen lubing the stock exhaust manifold bolts. i realized that the power steering/alternator bracket mounts to the stock manifold with 2 bolts or studs whatever. The headers I ordered are 5/16 thick flange. What would be the "flange" thickness of the stock exhaust manifold? Its not in my bugdet right now to get a remount kit so I need a spacer of sorts for now.