HELP! I put my heads on backwards!

[93CobraR]

I wasn't paying attention and when I put my heads on I put the passenger side on the the drivers side and vise versa. The only problem I ran in to is that I went to put the drivers side brackets on and the hole that the stud goes in is a emissions port, put it has threads in it and they are way to big for it. So what do I have to do here? Helicoil it? or what? I sure don't want to take the intake,rockers and heads all off agian. Thanks

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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's, long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 13.012
Best MPH 104
Best 60' 1.816

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