68 dart small block vs hemi
it's all about the money i think. what you want to spend. the hemi would definitely require some cash by itself, then all the goodies to get it in your car. it will change your bracket so you will be doing even more stuff to make it legal at the track.
but whatever direction you choose, go for it! :D figure out what you need and get 'er dun. you could even keep racing the 340 for now, and start stockpiling what you need for the switchover