Doesn't ARP list their B1 head stud kit for your heads? If you have their part number now I would call them and get you the correct parts to you ASAP for no charge.
What is the part number of the kit your using? The reason I'm asking is the first B1 kit I bought was going to come with 51 CC heads, I didn't want that small of a chamber so I ended up getting them with 76 CC
I have a set of B1-MC heads now that I haven't CC yet so knowing your kit number may help me later
Thanks in advance