Hi Ted,
I have always been a Ford guy and can tell you if you want to go with the FE style engines (352 -360-390-406-410-427-428) you will find plenty of help. Brent Lykins, Kieth Craft, George Anderson, Southern Automotive, and on and on have all proven themselves as reliable engine builders that can re-create your dream with the proper vintage power. If you want to go with a push rod engine in a small block those same guys can hook you up with your choice of hp and torque from a small block such as a 302 or 351 Windsor style engine.
The short of it is you have friends here that are more than willing to help with your build and your engine should you need help. Several of the guys have vested interests in their own products but I can tell you if your asking for help here many of the manufactures will offer their solution to your problem even though they didn't sell you their kit. We are a great community and we are all in it for a common goal.
So lets get started with the questions ...there is still time to get in some driving time in your new Cobra this summer.
Clois Harlan