Exactly. If you HAVE to have a 340, then it's going to cost you. It's your choice. Build a good, solid running 360 for a $2500 and it'll put a smile on your face. For $350, I think this would be a good place to start.
Keep in mind, either way you go, you're going to need motor mounts, new tranny/mount/driveshaft, bigger radiator, new exhaust, etc. Stuff adds up quick.
