They advise ARP studs, nuts and washers but can I get away with stock bolts and washers. Also is it absolutely necessary to change push rods if I'm keeping the stock cam ? Going with 1.6 rockers. Would the head dimensions be the reason for needing to check push rod length ?
The head is potentially taller though, and you may wanna check for that difference if you still have a stock iron head to compare it against. If that turns out to be the case, ( even if it's small like .030") using the aftermarket rockers will force you to take all of it into consideration with regard to making sure that the pushrod is correct.