If your rebuilding, with a different cam, you can do one of the best distributors (if the GM HEI doesn't yuck you out) by Performance Distributors out of TN
https://performancedistributors.com/product/ford-dui-street-strip-v8-221-289-302-cid/. Go directly to them and they will get all your specs and curve the distributor for you. Performance Distributors (DUI) are very reliable.
2-Another option is take your stock one and send it to Wes Adams at Hillside auto in Oregon. He is well known in the Ford FE arena.
3-Drop in Pertronix, always have a spare in the glovebox though, is great for the price and you keep your original distributor.
-Don't fall for the new MSD stuff. Sadly many former legit companies were bought out by big corporate and the quality has went WAY down.
-Duraspark is great, but for what your paying after all the modules/wiring/distributor you should just get a brand new DUI.
-If your going roller cam make sure to let the distributor company know so you can have the correct gear placed.