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Great news, put the air box on and it will tickover , makes a huge difference with it off, No2 is either not getting a spark or fuel, check the HT cap is firmly screwed to the HT lead first, if that doesn't work, swap the cap with one of the other caps, by actually unscrewing the caps and swapping them over, don't swap the leads,and see if the problem follows the cap, if that doesn't work check the plug is getting wet with fuel if it isn't you might have a blockage in the carb, but before anything else try with the airbox fitted, try holding revs at 5k and see if the pipe gets hot, if it does your primary jet is blocked on that carb, holding higher revs means it's running on the main jet, regarding the hissing god knows, is the breather in the top of the cylinder head clear?, pull the pipe off for now.PS video link doesn't work, YouTube is more reliable.
If you are going to use pods you'll need bigger main jets, I've used 135's in mine with a 4 into 1 exhaust and the mixture was bang on when dynoed, also check out my thread "how to make pod filters work", (no roll eyes on this forum , it's a league of gentlemen!), spindle spinning in neutral is normal, regarding what's typical when stripping the engine?, it's totally down to the engines previous life, have a search around the threads on this forum and you'll get an idea of the problems you might face, but you'll probably enter a world of pain, most do , I've rebuilt various engines over the years but when the time comes to rebuild mine I'm giving it to Trigger and paying for his expertise, the cost will be more than offset by me being able to spend my time out riding my other bikes and knowing the jobs been done perfectly (Trig you can knock a fiver off my bill for that 😄).
Unfortunately the CB750 engines weighs 93kg otherwise you could have bought a replacement , lots of cheap spares out there though so make yourself a shopping list.
I use a motorbatt gel, tipped on its side under the tail fairing, sterling service for the last 18 months, can't remember the ID number but if you EBay "CB750 sohc battery" you'll find em, think it was about £50 from a seller called busters , lithium are ok but don't like shorts so don't fit one until your electrics are sorted, about £130.
Not sure, about the same size and weight I think but the advantage is you can lie them on their side so they'll fit under race rep tail fairings, if you want light lithium is the way to go, so light they feel like an empty box.