But this article has everything but detail. What tease, boo.
https://www.fordmuscle.com/features/pro-street-lives-this-twin-turbo-galaxie-is-anything-but-bare-bones/

I came across this article from EPWI, see attached. It was given to me by a friend. It was just a standalone magazine for just this build, kind of a interesting way to promote your product. Like any magazine article it has misinformation, but it is not bad overall. Its a bit thin on details over the heads and camshaft, but the numbers are impressive for a 431. I do wonder if these were standard RPM heads or pro-ports. Either way not a cookie cutter recipe for getting 555hp out of a 390. :-) I do find it interesting as well that they choose a 4.125 crank over the more popular 4.25. I wonder if they have a surplus of those cranks to sell. :-)

Created any shit for you here. I am sad to see you delete you posts and remove
What was valuable information for me. I had hoped to read it a few times to
Learn something new. In the interest of not losing what I posted in your soon to be deleted post I will paste my response here.

“Whoa! I wasn’t trying to start a fight with my comments. I am just thoroughly impressed with this combination. You are pulling some high hp out of those heads and out of 390 ci without turning high rpms. I have been on these forums since the mid 2000’s and I have seen a lot off 390 builds and track times. There is a reason people stroke, use power adders, aftermarket heads, rpms,
etc to get better numbers. I know the ss guys use a lot of attention to detail and have a lot of knowledge to get impressive numbers out of stock parts and parameters. That is really what I mean by black magic. It’s the tribal knowledge of a platform and the tricks of the trade.
Us regular folk who don’t do this for living can only hope to pick up some of this along the way so thank you for being so generous with sharing the details behind the build. I know a lot do not reveal all because for those that race it’s a competitive edge. What is the intent of this motor? Will it see strip duty?”

Well there is no doubt it is a cast crank,  no $, no cross drill, and yes it’s the same stroke either way I am more curious because it’s an odd duck based on the casting number grooves mains and what the books show. I know they can be wrong but what it really is and more importantly what it is worth to other people is what I am trying to figure out. It’s part of a package deal and I am assessing the parts based on what I will do with them.

Those truck headers made power due to the exit length from the port not their primary size. Trucks have more room under the hood and the headers can make a straight exit out the port for longer than in any other application. Just like look at Barry’s dyno headers.

I’ll take those valve covers if payment falls through.

Since it was brought up I'll add to it. Chasing threads, I just recently discovered thread chasing taps. I had always used bottoming taps or starting taps in a pinch. Never cared for them because at times it deformed the threads and made the hole sloppy. But man what a difference thread chasing taps made. For those that don't have them, get a set.