header bolts

ok so I need to get my turbo mani bolted up but there isn't enough clearance like I would like for a standard sized head hex bolt. so I was planning on maybe a set of header bolts from mike but was wondering how long they are? will they have enough reach for going into the head and through about a 3/8" flange?
 
studs could work but I need a small head on the nuts. a standard head fits in there but just barely rubs when tightening it. I will prob get it bolted up for now and work on a better solution for later (I just want this running)
 
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