First of all, you don't have a pump for a "farmallh-450". You have one or the other because the 300-350 pump and the SM-400-450 pump are different size, different GPM, and most importantly a different bolt pattern.
Bob gave you some good advice, but one more point I don't think he mentioned was a reservoir. Probably 2 gallon MINIMUM.
What tractor are you working on? If it is an M (and maybe an H also) you need the late timing cover and front engine plate to mount the pump. Don't ask me how I know this.
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