Let's talk 318/349/390 strokers.

I've seen the Campbell Enterprises website and they have some stroker kits for 318 from USD 1500...

Anyone has ever heard about tihs company?

I don't often bad mouth companies - but I ordered set of rings from CE ...and got them two months later.

Several international phone calls were made ...many times they didn't pick up - even though I had triple checked the time zones. I'm an experienced International parts shipper and buyer. ;)

Finally got the lame excuse that they'd forgotten to order them - then he posted them by SEA mail...

I wouldn't go near them for International orders.

Another doubt: what kind of headers and seals do I have to install to have that volume of combustion chamber?

You're gonna have to re-word that question unfo - it doesn't make sense.

Do you mean "to SUIT that size of combustion chamber"?

If you're asking what size headers you need - various on-line calculators say 1.75 primaries minimum for a Tri-Y.

Not sure what you mean by "seals"