Well, a little background first:
I happened across these heads when a guy that lives not too far from me responded to a post on another forum of someone looking for a set of heads.
I researched them, and found that they were awesome heads, so I contacted him and he made me a great deal, because he was just trying to get rid of them--he is a Chevy guy, and had purchased them for an engine build project he was putting together for someone else, and that guy abandoned the project.
The details of the car:
I am planning on installing the BBF stroker I build into a 1970 Mustang, and in that car, I'll have the AJE Tubular Front suspension package that is based on the Fox-body platform (i.e.: crossmember under the front of the engine and rack & pinion mounted to it).
The EX514 heads I've got have BBC Exhaust ports, which means there aren't going to be any off-the-shelf headers I can use without major work. A set of Fox-body headers won't fit the chassis. A set of CJ headers for a 70 Mustang chassis will have to have a BBC exhaust flange welded on.
I can, however, get a set of off-the-shelf headers that were made for CJ exhaust ports, built for the 67-70 Mustang chassis, that I can make work with far less effort.
Also, the intake selections available for the P51/Ford Racing SCJ-x heads are far greater than what I can get for the EX514 heads--and cheaper, too.
I don't have a fabrication shop, just a two-car garage that is not very well equipped (small wire-feed welder, 30-gallon compressor, vise, grinder, drillpress and hand tools).
I also don't have a ton of money to have someone else fab up headers or know someone who can do it on the cheap.
So, I'll have to make do with the equipment I have, and it's far easier for me to do so using the standard port layouts that the P51's and SCJ-x's have than it is for what the EX514's have.
The EX514's are great heads, I know that, but due to my circumstances, a set of P51's would work out better for my project.
If worse comes to worse, and I can't get a set of P51's, then I guess I'll just have to somehow come up with whatever I need to make the EX514's work in the chassis I have, it'll just cost more (by having to buy more equipment, or having custom-made parts) and take more time.