I'm going to be using a cherry picker to pull my engines and I need to bolt chains onto either side of the heads. What size bolts do I need?

Also....what are the size of the bolts for the fuel pump block off plate? The bottom 2 I have, but I don't have the top two and they are slightly larger.

 

Most block bracket and bolt holes in the head are 3/8-16.

 

I think there are a couple different size holes on the head/block.

Someone told me 9/16 - 16 as another possible size. I'm just going to go to Home Depot tomorrow and buy a bunch....they're all 16 threads right?