[Bobo]

Thanks for reply. These Jr manifolds are great for 2500 - and up RPM. What I've forgotten to tell - actually I'm looking for low end torgue instead of Hi RPM HP. Even if the Cobra is a light car. Not going to race it, drag, quarter mile, or so. The 0 - 5000 (or 1500-6500) range would be more efficient for me.
There is a little problem with the heads. If I would change them, first I have to import them from US. Shipping is not such a great idea, taking them with me is not possible. And the cost is a little problem too. I'll keep the stock heads, and try to squeeze the best of them.
Excuse my English - I'm not from an english speaking country.