Not all SBF distributor shafts are all the same size....

[Madgyver]

So much for getting it running today..
Wrong gear shaft size.. set back 4 days til right gear arrives..
Stock 351W .531 distributor shaft...
I'm not stock with a .500 distributor shaft...
I could get by with steel gear for a week?
Patience, Grasshopper...

 

[bronco italiano]

I would wait

4 Types of Distributor Gears​

There are 4 basic types of distributor gears. They are listed in order from softest to hardest.

• Composite
• • Made from a super strong polymer.
  • Durable and lightweight.
  • Compatible with all camshafts.
  • More expensive than other types of distributor gears.
• Bronze
• • Made of a bronze/aluminum/nickel alloy.
  • Soft material will not damage the camshaft.
  • Used with billet steel cams.
  • Sacrificial gear for racing applications.
  • Should be changed more frequently than other gears.
• Cast Iron
• • Harder than composite or bronze gears.
  • Used with cast iron, flat tappet cams.
  • Less expensive than other types of gears.
• Melonized or Hardened Steel
• • Heat treated for durability.
  • Slick surface is compatible with any type of cam.
  • Often used by the OEM for long life.
  • Generally used as the default gear on replacement distributors.

 

[ba123]

Sorry man, that sucks! Yes, def wait. Don't do anything you might regret and you prob will.