[Bill Bess]

OK, I've read all the post and here is my 2 cents.
First of all, decide on how the car will be used...racing, drag racing, road racing or cruising and conditions in your neck of the woods.
Then think about car quality, engine type and authentisity, too many cobras have a "run of the mill engines".. small block Fords, chevy's (wrong) ....sorry not trying to offend anyone, just my opinion. Too me a cobra should be running an FE, no matter what cu. or outside accessories, it just is right.
Check out Southern Automotive, Bill Parham will build you your dream engine, complete in everyway and reliable, plus they stand behind their product. In addition their prices are reasonable.
Bill PS. I'm a fan, over 15000 miles on my 428 FE, run great and is fast.