Pushrods

Hi,i´ve built me new engine for my Dart.
Head are milled and ported,a bit hotter camshaft,Four barrel,headders.
Runs,but with one problem.
Keeps bending the pushrods.Put stock ones in.Since i live in Sweden and have talked to a couple of different shops about harder pushrods,and they can´t help me.
Is there anyone out there who knows where to get hold op some?
Thanks.
Per (from Sweden)