I called a shop that specializes in machining heads in my area. I've got a set of Pontiac 17 heads that were machined by NAPA about ten years ago. Got'em off Craigs. I am getting this cam set from Lunati, 10510701K. 5200 RPM. Springs need screw in studs.
The shop quoted me at 125 to install studs. Here is the part I don't understand. They said something about 7/16 and needing Heli-Coils possibly, which would raise the price to 250. What does this mean?

You have a 350 engine?

17's are press in studs I believe.

I would dump the 17's and find a set of 18's or 72 cc heads with screw in studs already done.

I don't know the size of the studs. If the stud hole diameter is too large to thread for the screw in studs an insert could be used.