The new mustangs are laying down incredible numbers on the new 5.0, I've seen several at 900 rwhp on a stock internal engine.
also, LOL at guys calling the 6.2's big blocks lol
The new 3.5 EB is an all new engine, new block, etc. And it will share parts with the new 3.5 EB in the GT supercar. Exact same everything no, but share many parts yes. The biggest limiting factor on the ecoboosts once modded have been fuel delivery. When guys go really extreme they often add manifold injection as well with a standalone to go along with the EB Direct Injection once they're maxed out. I saw an article the other day that said the new 3.5 for the raptor had both direct and manifold injection, which would be a huge hurtle jumped for making even big power out of the EBs. I looked at the pics though and couldn't see the manifold injectors though so not 100% sure on it despite the article stating it.
I also saw another article from ford the other week that said the new 3.5 EB raptors should be on par with the old roush raptors for performance. Hearing that from a Ford article, seeing the article from the Chicago show about the manifold injection, and then hearing this rumor of 511, I could see it being plausible looking at the writing on the wall. Not saying it'll definitely happen, but it wouldn't surprise me if it did.