Alright, I am sure this has been covered a million times already, but I am getting a few different answers in my searching around. I want to run a 255 width tire drifting with a gutted SN95 shell, which would be great at around 400hp. I want to run a simple single turbo build with a Megasquirt ECU. Now what I want to know is, is it worth modifying the engine at this point? Isn't the 302 block weak past 400hp to begin with? From what I've seen I can make high 300s on a stock engine. If this is in a thread already on here I missed, I would be more than happy with a link to it because this must be the most common question ever.