He can continue to find useful tweaks for at least a few more days. 

And when it's as good as can be:

"Ready to try to raise the dead?"

"Ready and willing." 

"Eeeeeeeeeee." Bounce bounce bounce. 

One fresh Ben Franklin corpse with patched up lungs, go.

The spell goes off without a hitch. 

Benjamin Franklin opens his eyes. He inhales, then his brow furrows and he breathes again. 

He sits up and looks around. 

"Hello, Mr. Franklin! How are you feeling?"

"My chest doesn't hurt. Is this Heaven?" 

"It is not! This is an orbital habitat above the Atlantic Ocean I made for doing magic experiments on. I suspected you'd be okay with being the subject of a resurrection experiment based on your writings on the topic. It's delightful to meet you; I'm Cam, that's Wilbur, and the invisible party over there is Lucy."

...He looks at where Cam indicated an invisible party. 

"Hi," Lucy supplies helpfully. 

Ben Franklin returns his attention to Cam. "Who are you? Why are we over the Atlantic? How are we over the Atlantic? Why do you have wings and why is the lady over there invisible?" 

"I'm Cam, like I said. The Atlantic happened to be closer than the Pacific. We flew here in a flying vehicle. I made the wings; I can make arbitrary material objects. She is invisible for peculiar heritage reasons."

"I mean are you with a government or other organization or working alone. How can you make arbitrary material objects? How arbitrary is arbitrary? What kind of peculiar heritage reasons?" 

"I am working alone. Well, Wilbur and Lucy are consulting. I have magical powers because I am from another dimension; arbitrary is pretty arbitrary with limits like 'it'd take me a few weeks to make a planet' and 'not antimatter' - antimatter being stuff that is the opposite of matter and mutually annihilates it if they come into contact. Their dad is some kind of monstery god thing."

"--Monstery how?" 

"Monstery as in if he were ever fully summoned to this plane of existence life as we know it would cease to exist. We're fairly sure the same doesn't apply to us." 

"I...see." To Cam: "So does that mean you can naively create machines to perform specific tasks, is that how--" and he sweeps an arm to indicate the whole room. 

"No, that's not how - I have to know what I'm making, or copy something. In the alternate dimension I'm from it's 2157. Here it's only 1928, they've got some advances you haven't seen but I'm way ahead."

"Oh." 

"Welcome to the future!" Wag wag wag.

"What has happened to my country?" 

"The US enjoys a prolonged period as the most wealthy and powerful nation in the world. It also commits some atrocities but most powerful nations get around to that."

Frown. "What kind of atrocities?" 

"Uh, took a long time to get around to ending slavery, and though it has happened by this year it takes a long time to calm down remaining racism. In my world there was this big war against among other participants Japan and the United States decided to round up its Japanese residents and put them in concentration camps, and also dropped two very destructive weapons on Japan about it, and there's not really a plausible story where this was connected to any of the genuinely bad things Japan was up to in the Pacific theater, that seems to have been a coincidence. Lots of invading random Middle Eastern countries and propping up dictatorships in South America for economic reasons. By 2157 things have settled down a whole lot, though, and I bet this world can skip a lot of crap."