Two easy options really.Silly question....you mentioned that for a cam like the one you told me about that I would need stronger valve springs...how do I know how strong they need to be? and where can I get those at?
Norris sells double springs and aluminum retainers for Opel heads. You might need to shim them differently for the 2.2 head, but they should work.
Alternatively I used to sell a single "drop in" spring for 2.2 and 2.4 heads with stock valves and retainers. This was in my C & R days. The OEM 2.2 springs will coil-bind at .475" lift, and had around 180 lbs of open pressure. The springs I sold would coil bind at .510" lift and had around 210 lbs of open pressure. They were made by Pioneer spring. I can look them up in my old spec book. They were very inexpensive.