How fast will my car run

At first. Sorry for my last post,i push the wrong button and now i can`t delete the post.

In moment i have only this heads.
I search a set of 340x or 360 heads.
How big are the valves in the 360 heads?
In ebay germany is one 360 head for sale but i need 2 heads. :-)

I hope also i get next year an Converter with an higher stall speed.