my all city fork has 30mm rake with a a2c of 375 and the new leader carbon fork has a 30mm rake with a a2c of 368. if i put the leader fork on my big block it won't make that much of a difference will it? i'm not really knowledgeable about fork rake and axel to crown lengths and how they affect the ride of things. can someone explain?

also does the leader fork have a larger crown for integrated headsets that would make it look weird on a regular headset bike?

6mm most likely wouldn't make any sort of noticeable difference.

The oversized crown would indeed look a little strange with a standard head tube.

There's another possible problem if you have a front brake. The rim will be 7mm closer to the fork and the stock medium reach caliper might
not work.

Oh yeah. I always forget that some people use brakes.

Keep in mind what size tires you want to you use as well

no brakes. can anyone recommend a carbon fork to me that has the same measurements that isn't oversized?