One of the problems you will run into is with newer crankshafts, and aftermarket cranks is whats called an oil slinger. This is exactly what it sounds like, just a ring on the crank close to where the seal go's, I would guess about .100" wide and sticks out like the rings of saturn. These usually need to be machined down to fit properly in the older blocks. You need to pay close attention to this so your not making metal shavings. Its hard to see this too, most people will notice the crank freezes up when they torque all the mains and cant figuer out why. Other then that the internals will fit, and your already aware of deck height so be sure to mill your block for proper quench. As far as the seals good idea , I have never heard of it being done, but anything is possible.