273 to 340 swap in 65 dart
The only thing I can think of concerning the water pump is that the 273 water pump has it's inlet on the driver's side of the engine & the 340 might have it on the passenger's side. If you just use the 273 water pump you'll becovering up the timing marks on the timing chain cover. You'll need both the pump & cover from a 273. All of this applies only if the pumps have their inlets on opposite sides. I've seen the mini starters on eBay for about $50 plus shipping. I'm pretty sure it's about the same as a later model starter from something like a Durango, but couldn't tell you what year. I'm sure that other people will ring in here with things I've forgotten.