Thanks Barnbird. Again and again you have bailed me out. I used the bolt that I had from before the rebuild. Just tried tapping at 1/2" to clean up the threads and it's stripped. I'm going to try another 1/2 bolt just for kicks. I'll need to tap either to a metric (yuch, but maybe necessary) or go one size up 9/16. Either way it 's off to the hardware store. Grade 5 or grade 8 for this?

If not where do I mount the wood under? I could make a u channel to ride under the Oil pan bolts My oil pan looks really nice, so I don't want to muck it up.