"Doweled" as in, wooden dowels in the holes. I've used old head bolts with the heads cut off, as well (removed with a vice-grip). If clearance was an issue, short dowels. Wooden dowels got a screw in the end so they can be fished out with a magnet. If I had to use head bolts (never had to), I'd slot the ends so they can be turned with a screwdriver, then fished out with a magnet. I learned this from a retired Ford technician (50+ years) neighbor when I was a teen. He said he had a set for every engine and vehicle he worked on, and never just "tossed" a head on a block. "It's just too easy to do it right the first time." All of my first vehicles were basket cases (dirt cheap or free), so I got a lot of experience. I paid more on DMV fees and insurance than vehicles for many years.