70 340 4-speed dart - talk me off the ledge

My advice? Buy as cheap a running/driving car as you can, even if it's a 4 door. That way you have one that you can drive and enjoy now and then get the 340 car in the shop and start the disassembly and "restoration". Then once the 340 is done you can always sell the other.

I plan on doing something similar with my 72 Duster, it took me 2.5 years to get it driving (first drive was just over a week ago) there were times I got burned out and didn't touch it for a month or 2. Now that it's drivable I'm gonna do everything I can to keep it that way, my money will go toward improving the mechanicals and doing any metal work that can't be seen from outside and getting the interior done. Then I'll get my 67 valiant 4 door running/driving BEFORE I tear my Duster down for body/paint so if I get burned out on my Duster I can take a drive in the valiant to relax and get remotivated.

And if you were much much closer to me if be more than happy to lend a hand on getting that awesome car back to its former glory!