It obviously depends on the condition and desirability of the pieces parts. If they are mostly stock, you can expect to not get much at all for them. Most folks don't part out for profit as much as they do to simply recoup what value they can from the vehicle.
With that said, if the engine is healthy and in good condition, you easily get 500-600 for it in which case (based on your prediction of getting it for 625$) you're only 125$ from breaking even.
To gain a sense of what prices go for, do some market analysis... In other words, look around at others prices for stuff they're parting out/selling.
In most cases, it's probably not going to be very profitable to buy a car for the purpose of parting it out. Typically, you will have a purpose for a specific portion of the car. Maybe you want the engine, the rest can be sold to offset what the engine might normally cost. May you are working on a race vr6 turbo build, in which case, you plan on gutting the inside and don't want any of it. In these cases, the cost of the purchase is justified with a purpose
Lastly I'll say this, what is your time worth? In most cases you'll be doing the part removal and shipping... If it were me, I wouldn't trust most folks to pull their own parts of my car... If someone wants the engine, you're the one pulling it! If someone wants the shift linkage, you're the one that gets to dig it out. If you are perfectly fine with that, go for it!
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