1. Keep the 340.
- The block will need to be sleeved to re use. $1,200.
By the time you find another block and do the machine work you will be right around the same money. Sleeve it and get it back to standard bore.
3. Start over with LA360
- Machinist has block & crank $250
- Rough estimate of machine work and parts (re using my rods) $1,600 (including new flywheel and balancer)
Economical option if you are not matching numbers. Yeah, stroke it while your at it :)