I hate to step in but the only way to go in my opinion after driving numerous carburated engines and on my second cobra is a Roush engine. Not one drip of
oil, water etc. It runs perfectly every single time I turn the key. Excellent power throught the entire rpm range. I have not used them but I have heard warranty work is quite beauracratic with preapproval blah blah blah, in all honesty I am getting enough miles in 90 plus heat on the car I doubt I will ever use it. Oh wait I did have a problem, I had to tighten the alternator belt, sometimes I would hear it slip on start-up. What a pos!!