Help identify please: power or manual gearbox?

Yes it's a PS box you have...and the engine pictured is not a 360 by the balancer,possibly a 273/318/340...most likely a 318...you will need to find a pump and brackets and hoses for the PS to work and agree that you need to either replace the PS gear box or flush the one out you have which most likely had an issue...shouldnt be hard to find here on this site....