Air injection tube removal....now what?

[mean81GT]

The threads are not the same as the accessory holes. I know this because the ******* engine builder put the heads on backwards, and wouldn't fix the problema after it was discovered. The owner of the vehicle doesn't want to rip everything back apart, so we kept the heads the way they are. We were able to fabricate new ways of mounting the front accessories, but the holes are gaping, and we need to seal them up. After all the work, JB quick weld isn't too appealing, but we're almost at our wits end with this project. Are there any caps for these holes that sit flush with the head? If so, where would I be able to pick them up? I tried getting something from Ford, but they claimed "Ford won't help a customer hinder the operation of the emissions system".