I take it the rest of the engine is stock? A timing light is still a very good idea. Borrow one from someone our get a cheapo for Checker or Autozone.
One side note, if the engine is stock or fairly stock, the 850 Holley will probably drown the engine and cause some serious bogs. But on the other hand, the Ford racing wing nut might off set any negatives the carb puts in! LOL