There are two types of B230. The difference is in the size of the crankshaft bearings. Early ones are small, late ones are larger. The changeover happened during the 1988 model year. The early type is adequate, but the late ones should last a lot longer.

I don't know that it makes much difference what type of sensors the replacement engine has. Presumably, all of your original ones were working properly and can be swapped over onto the new engine. Not that hard with both engines side by side on the garage floor.

Make sure the engine you are getting is from a 240. The 740 has the distributor mounted on the end of the cam instead of at the front left side of the block.