Rocker Arms = Hopeless?

[plastic_cow]

Okay, so I've run into a bit of a problem, I got these heads (ford part #D70E-DA) and I can't seem to get rocker arms to fit 'em... I bought the compition cam's 1.6 3/8" rocker arms but when I put them on the mount (stud mounted) they slide all the way down to the bottom... on my 88 5.0 heads - there's a rocker arm channel that they fit into, but those are pedistal mounted, and apparently, according to the 'genuine ford part' mechanics, they don't apply to late 70's/early 80's stud mounted engines... does anyone know if I just need to swap out and get the 7/16" rockers and that will solve my problem? does anyone have an easy way to test for a problem like this?
The only thing I need to get my engine back together is the damn rocker arms that will fit these heads... (early 80's/late 70's Mercury/SBF 302)
Any help is much appreciated, as per usual!

 

[morrisracing]

The ford racing catalog shows that the late 70s head has a modified pedestal and if you are going to use adjustable rockers you have to mill the bosses .230 thousanths. You will also have to use guide plates and hardened pushrods. Here is a link that may help. http://www.fordracingparts.com/download/enginetips/enginebuildingtipsandspecs.pdf

 

[plastic_cow]

Would it work if I got a conversion kit for the shaft?

 

[morrisracing]

crane cams shows a conversion kit #36806-16. But it uses factory rockers, so your comp. rollers wont work with this kit. Im sure that someone makes a kit that uses roller rockers but I figure that they are not standard roller rocker arms.