edelbrock includes 2 long headbolts with smallblock heads because 1 intake port on each head is without the stock mopar intrusion. the edelbrock bolts and factory bolts are necked down to .450" , helps get oil to rockers. I run 18 1/2" head studs and 2 bolts for this reason. maybe there is confusion between excappa and the head guy, the big mouth porting is moving pushrods over-not porting thru head bolt passeges