Best Cobra engine?

[FUNFER2]

I've been considering a cheaper engine to build or buy, than my "FE" next time.
The crate 514 looks good. With yours, the cam is a good question. I was told by the two, of the master FE engine builders that a roller cam on the street is not, the way to go. They said you'll be replacing the lifters ect. after apx. 5k miles on the motor. I still don't understand why ? I built mine using a solid flat tappet. I would like to see alum. heads, big cubes, alum. pump, run on pump gas. Your price, hp & torque numbers sounds great, although.....Id like to see maybe, 600 hp ? For your asking price of $4,500, you can't go wrong with the information & specs provided so far.
Thanks,