72 340 build vs...other options

Pretty much the same here.

I’m a 5.9 guy because of the availability and low cost for good quality.
A 340 that needs parts and machining to be strong and reliable is going to cost a lot more just to be able to say it’s a 340.

Now if I had a rare car that originally had one, it would be different if I was concerned about resale value.
I can understand that .