273, or 318?

OK, main bearing diameter I had forgotten about.
As I mentioned a 1940 Chev project in post #94, I do not row the boat the same direction as everyone else. I like something different. The guy I bought the Chev coupe from has one with a pretty good body. 8 to 10 years and he still can not decide on the engine to use.
-301 turbo from the Firebird
-A 350 vortec that he is not sure of the condition.
-454 Chev from his 72 GTO that he now has a 455 Pontiac engine for.
-an LS from salvage.
His thought for me was just get a LS as everyone else is doing. Not my river to paddle.
You can get a 3.58" crank that has 340/273 main bearing diameter. Eagle, Molnar, and Scat all offer them. Heck, if you're feeling froggy, Molnar has a 3.79" stroke crank. It has SBC sized rod journals though. As @toolmanmike mentioned, pistons for a stroked 273 might be "fun" trying to find. Heck, 273 pistons for the stock crank are kind of an issue unless you're happy running Egges.