No way to do it with the distributor installed other than to remove the spark plugs and crank it over.
If you decide to buy/build a priming tool, it <span style="text-decoration: underline">must</span> have the part of the body that goes inside the block by the distributor gear--it's the round aluminum part with the groove in the middle on the right of this picture (This is the Crane priming tool). This is required as it completes the oil galley path at the back of the block. Without it (such as the Moroso unit in the 2nd pic), oil will not reach the top of the engine.
