Building a new 505 With Callies / Mopar Performance Block

I have a set of 240's here for a friends 505 street motor build and my 270's both sets are tight. Very little if any side clearance. Hopefully the shims will work if not both sets of heads will be back to the machine shop. Also, I went to the local supply house all they had was normal hex head bolts. I bought three so I could continue on my motor this weekend in case the ARP do not come in tomorrow. I did notice that the hex head bolts would interfere with the hole for the cam button.