A '68 GTS is a fairly rare car. If the 340 was the original engine, I would recommend a rebuild if the block is salvageable. A sound stock '68 340 was no slouch, and there are a lot of upgrades available today. You can get some big power out of one with a stroker kit. As 57ChryslerDart recommended FABO is one of the best resources out there. Lots of info in the archives, and lots of builds, even late model HEMI swaps. Good luck with your rebuild.Hi I have a 68 dart gts 4 speed car. The motor a 349 was detonated a couple of years ago. What are my best choices to re power the car.