$5000 to get either a brand-new Hemi or a stroker LA motor?
It's a no-brainer. Seriously. The Hemi makes more power, gets better mileage, is brand new, and weighs a hundred pounds less than an LA motor.
I'd say even if the Hemi costs $2000 more than the other engine, no matter what other engine, it's a deal.
Also, the Hemi will add value to the car over everything other than a numbers-matching 340. I know this isn't part of the calculation, but it's so, anyways.
This website should have theme music. I suggest Jethro Tull's "Living in the Past" would be appropriate for 90% of the active posters.
R.