What is the difference in HP power limit from a stock LT1 intake, edelbrock, ported LT1, LT4, Wilson intake, accel intake.

 

You are not going to get much in the way of good answers to this question, but over 500rwhp has been done NA with a BASIC port job, little welding on an LT1 intake to make it port matchable to LT4 style heads and under forced induction it has done pretty close to DOUBLE that number.

Also there is no "limit" it is a restriction that gets greater the more you try and make with it.

That said it is THE right choice for the vast majority of builds. The rate at which guys with mild setups are being convinced they "need" to swap it out is a joke.