can i use my stock brake lines on a aftermarket brake booster delete? (first time doing brakelines) will be on my 95 civic

 

The issue you'll run into is the stock brake lines have two lines coming off the master cylinder and brake booster deletes only have one outlet. So you'll have to have the one line come off the brake booster to a "T" then those two lines into your prop valve. After that, I think you'll be good.
But honestly, you should just do a whole new line setup. Like the kits sold at Chasebays.com