Lot's of good info here....
You need t ask a few more questions.
Are you a mechanic?
Do I want to be tweaking carburetors?
Do I want o take Long weekend cruises?
I owned a Cobra with a Small Block and found myself dealing with Carb and ignition issues thus in the garage tweaking more often. In our State rally early in the spring, it was 90 plus degrees and we all got caught in traffic nd had motors running hot..
I asked and answered the above questions sold my Cobra and built another with a Coyote. The torque is more than enough to hook up the 315 30 18 Azenis when geared properly.
Its your Money therfore get what will make you happy! The Coyote is being applied in numerous applications in these cars and is Proven!...
Here is a link to my car!
https://youtu.be/rgyOCmeAJ-0
Best of luck!