It looks a 310B I had. ID plate should be on the right cowling cover, behind the loader control valves. No big surprise if it's not there, most seem to disappear for some reason.
If it is indeed a 310B, if I'm seeing correctly, it is a later model of the series because of what appears to be 8 lug rear wheels. The early series like mine had 6 lugs.
I do believe they were 6V from the factory, but mine had been converted to 12V neg ground. A buddy of mine who runs a starter/alt. shop fixed me up with a single wire alternator, but you will need to put a resistor inline to the ignition. TSC has them for like $7-$8.
Probably the best way to narrow down to exactly what you have, is to find part on the engine, and castings. If it's a 310, it should have the 148 cu. in. engine. Great little engines..!! If properly tuned, and is getting fuel, they will run.
As far as the plug wire routing, probably best to remove #1 plug, and get it coming up on compression, and get it to TDC. You should remove the dist cap, and note rotation before hand, just bumping the starter. Once you get #1 position located, follow the firing sequence which should be cast in the block. IIRC, it's 1-3-4-2. Take note they used 2 different distributors on the 310's. Autolite & Prestolite, and I do know the dist caps are NOT interchangeable.
More than likely, the brakes will be like steeping on a plum, and not much stopping action, due to seals leaking on the bull pinion shaft. Just the nature of the beast's. If & when you get to that stage, let me know, I can give you some pointers on that. PM me if necessary, if I happen to lose track of this thread.
Here is a link to the Case/IH Ag. parts online parts store.
Official Case IH Online Parts Store and Case IH Catalog for Best Parts Search and Best Parts Look Up. Case IH Parts for Case IH Tractors, Case IH Combines, Case IH Tractors, Case IH Manuals, Case IH Parts I've already selected the 310 series, and you can do some part number searching from the engine block, etc. to determine exactly what you have.