Interesting thing the 1.6 rockers. If it works it would be an easy improvement.

I thought a stock 350 withe a stock cam had his peak power @4000 RPM and the maxi RPM around 4500.
Until this week-end I hadn't a tachometer on my car. Now I have one (Autoguage) and I discovered that my engine can reach 5000 RPM. Maybe it's normal, or the headers and dual exhaust helps?

Gilles