340 magnum from 73 dodge dart rebuild

The quote will be the same for any LA engine. Might as well go for more cubic inches. The lower you csan keep the RPMs, the longer the build will last.
Go for a stroker.
You must have a plan before you start anything.
Old saying, Failing to plan is planning to fail.
Get your ducks in a row. Find a reputable builder to get info on what you are trying to achieve.