Chevy 235 identification

I'm getting ready to replace a 6 cylinder in a 1941 Chevy with what I'm pretty sure is a 1957 235 from a Powerglide. I say that because the casting says B-14-7 and the serial number stamped next to the distributor is F220B. What is puzzling me is what I need to do around the water pump for clearance if anything. I can't see the casting number on the motor in the car but the stamped number by the distributor is HCMI 572 which I can't seem to find anywhere. Both motors are 37" long and from the block where the thermostat housing bolts on to the centerline of the fan belt is close to 2-1/2 inches on both. Has the original 216 already been replaced with a 235 and a short water pump installed? Here is a link to pictures of the car and the engine I want to install. Can anyone shed some light on this for me and maybe make some other observations from the pictures? I sure would appreciate it.
There are three sub folders. 1) General pic's of the car and engine 2) the replacement engine 3) a photo of that funky serial number on the engine in the car. There are also pic's of a rebuilt ****** that came with it. I may use it or I may not. The guy I bought the project from was going to use it. He said it was rebuilt and it looks rebuilt.

http://s371.photobucket.com/albums/oo157/mrmowerguy/41 Chevy/

 

Are you asking how to distinguish whether or not the engine you thought was a 216 is actually a 235? (If I'm understanding correctly) To my knowledge, the best way to distinguish the two are by the cover on the side of the block. If I'm not mistaken, the 216 goes all the way up to the valve cover, whereas the 235 cover goes up to the bottom of the cylinder head.

I can tell you that there were two water pump options available (as I found out), one was a short shaft, one was a long shaft. You will also need to know whether it was a pressed-on pulley or a bolt-on pulley.

I apologize if none of this is helpful for being what you're looking for.

 

The engine that's still in the car is a 216

 

You might also want to try the Stovebolt Forum

 

Looks like a 57 engine, the F220B number combined with the casting date make it look like that. I didn't see the HCMI 572 number in the pics?

The water pump looks like it's been shortened. If it fits in the car, great. although you might want to see about finding a spare at your convenience instead of when it starts leaking.

 

The engine you are planning to install was cast on Feburary 14 1957 for sure, It is 235 the water pump on it goes back into the block. The water pump on a 216 mounts on the block. You can swap pumps with special short shaft pump cut one down yourself and press the fan mount hub back. The head casting number ending in 848 is one of the better heads and some one has alredy installed an HEI distributer. Not enough pictures to say about the one in the car but looks like the block is cracked in on of the pictures?

 

Looks like a 216 to me,

 

Boy is it cracked!! It runs from the front of the engine on the intake/exhaust side all the way to the rear of the engine. It's a real shame because the engine starts easily, doesn't smoke and runs strong. The previous owner tried several sealers both internal and external and nothing worked. Then again if it had not been cracked it would not have fit into my budget.