i took out a bell housing bolt and took it down to sears hardware and got 4 bolts that were about 1/3 longer since it needs to get through the arm and into the block
I think I used head bolts on mine. I thing I ended up using 2 short ones and 2 long ones. Don't remember for sure. I had an extra set of head bolts, and did not use the ones I was going to use on the car.