We've done similar to a few cars.
Yeah top off the fluids and have at it !
In a day or two change the oil and filter as there will be some small metal grindings if it was seized bad.
Of course check for a blown head gasket, but it may be just fine. If the 2nd batch of oil isn't milky and the coolant stays at level, drive her till she dies !
Oh, since you paid $300, go crazy on the aero mods. Who cares how it looks
