Stock steel rockers for FT hydraulic cam - like the ones linked below - will fit stock and stock replacement heads. Generally good to .5" lift and matching springs. I do not think width of the pedestals matters but not sure.
Can you share some specifics on your heads, cam and combo?
http://www.manciniracing.com/mararoarmset1.html I haven't got the heads yet, but I'm building a close-to-stock 2nd engine for my car on a budget. I plan to run iron heads (452's or similar unleaded-friendly seats), open chamber, and the stock (or stock-style) non-adjustable rockers & a .470"-.480" lift range cam (just larger than stock).... think "Hemi-grind" purple shaft.
The reason I ask is that on my current motor, I have the "wider", non-machined rocker stands ('71 heads I believe/top picture) and when I put on Isky adjustable rockers, I had to take a file to the rocker stands for clearance to get the rockers to line up over the valves properly.
I'm just wondering if I'd run into a problem with stock rockers if I buy the heads from one guy and rockers/shafts from someone else. I haven't run non-adjustable rockers arms in 20+ yrs., so I really don't know.