Gen ll Hemi exhaust rocker arms

Well, after removing the 5 rocker shaft bolts, I find that it is necessary to drive the shaft in and out. I need to replace no's 1 and 7 exh rockers. So, I can do that for #1, but can not drive it back from the firewall. So now it looks like I will have to remove the whole stand assembly, that means the 5 center head bolts. Looks like I will seek further advice from Ray Barton engines.