Budget 347 Torque Beast
I'm no professional or expert, but I've read a bit about the 347, and I've got one myself.
You don't need forged unles you are running forced induction or some huge HP (500+ I think)
The 347 is a little more rough on longevity. you are actually putting more angle on the piston because of the longer stroke. If you build it right, it should run for a very long time.
Intake and Cam are up to you and what you want. Match these all together with how much horsepower you want and what kind of idle you want. I'm sure the performer RPM setup would do ok. shop around though.
My 347 is forged because I one day want to run forced induction. it is considerably cheaper to run nod iron, and unless you run huge power or torque, or force a/f in there, you'll be fine.
You will enjoy the Tq from the 347, it's awesome.
1964 Galaxie 500 347
built to fit a 6-71