Engine 258 intake exhaust stud swap

[Basod]

Running into some clearance issues that will require a bit of grinding when reinstalling my intake and exhaust.
Is it a good idea to just replace the bolts with studs? and I’m trying to find new Belleville washers as mine are kinda stove up.

 

[NotTJ]

3/8-16 studs are sold on the Dorman help section. Even comes with nice brass nuts. Belleville washers from McMaster Carr