Flex Plate Bolts...

I get by with cheap-er tools too, never broken one... my friends have but I guess that's the benefit of being slow and careful, I'm not a professional mechanic so I take all the time I need and use a soft touch.

For shallow-head bolts I take a socket and grind/sand down the end so the "teeth" are flush instead of recessed. I had to do that for installing the oil filter threaded adapter piece that holds the filter plate onto the block; very thin hex to grab, drove me nuts and then either I got the idea myself or from someone on here, I forgot lmao.

I just installed ARP main cap bolts in my 440 and notice with ARPs the drive heads are on the shallow side. I didn't have issues but I used the shortest socket possible and was very careful to not get it crooked on the bolts.