I forget exactly. Since I have only read up on this and not exactly done research as if I was going to do this myself.
The "In BOLD" above in your quote, who is they? And where did you read this? I'd like to gain some knowledge here. Olds guide plates? Interesting, very interesting. Do tell!
On a counter note, inexpensive roller rockers for the shaft mounted "LA" heads would be more money than getting the mods done to have the Chevy styled rockers beefed up and working right/best.Yup,Mopar inflation is at work here.
Huges engines has a set for $450.
A while back, my Comp Cam roller rockers were $300 Inflation has run rampant for about 20 years IHO.
Whats the cost of the girdle? Any mod to it to work? Drilling and tapping the head for a larger stud? Shhhhhhhhhheeeeezzzzzz-it! My daughter (16) can do that!