340 Stroker: experiences with parts

Those cylinder heads can be ported out to a pretty good level for performance. The intake is a very old one. Port matching it to the heads will help with a little power and improve the fuel quality from intake manifold into the head and cylinder. You could use an upgraded intake manifold.

What is it that you mean when you said headers are hard to check?
Are headers hard to get into the country or is it a legal issue?

For a rotating assembly. I myself would look at ether a Scat or Molnar.
For headers, ether the TTI or Doug’s. I like the TTI’s.
If you’re not going to port the LA-X heads and purchase new ones, look to the Trick Flow heads. Same for your intake manifold, if your not going to re use the Offenhauser, get a RPM-AG.

Nice looking Duster. Enjoy the build.