i want to upgrade my stock 26lb injectors to ls2 34lb injectors. What is the difference between ev6 and ev1 style injectors?

I have a Ls1 out of a 99 Trans am that im putting into a 95 camaro. i was wondering if there was a injector size larger than the stock 26lb ones that will clip right in with out buying the adapter harness for each injector?

Thanks