Buy a new crankshaft.
3.48
A 4.060 bore with a 3.75 stroke is 388. A 4.060 bore with a 350 crankshaft is 360. yes the cubic inches of a Chevy small block with a 4.060 bore and a 3.75 stroke would have 388.4 cubic inches of desplacement however if you have a 4.060 bore and a 4.00 inch stroke you can have 414.3 cid but you have to use a 5.850in connecting rod for clearance of the counter weights
NO.
3.480 inches
It is 3.48 inches, the same as the Chevy 350 crankshaft.
The Bore of a 350 cid engine is 4.00, the stroke is 3.48 inch..
4.00 bore 3.48 stroke
Yes, kits are available allowing you to "stroke" a 350 engine. Doing so increases the piston stroke by increasing the crankshaft "throw".
4.000 inches -- same bore size as a Chevy 350, the difference is a 327 uses a 3.250 stroke and the 350 uses a 3.480 stroke.
What do you need to know about it.
No, they are not interchangeable.