Am i crazy or am i on to something here?

If in the same boat, I would sell the 340 seeing as its not original to the car, to fund the running motor, be it a 318 or 360 (especially the 360) .. its better to bite the bullet and have a vehicle you can drive to relieve stress, then to stress over the 340 and when your going to get to enjoy it.. my car is always a stress reliever, even when it needs repairs ..good luck