indy "x" heads or edelbrock rpms?

Thanks guys I have heard of some problems with hughes in the past but have never had any problem with them myself.

Also would the air gap be a good manifold to use?
I also forgot to mention I'm running spitfire headers.

the way the engine is now I dyno'ed it and it made 275 hp at the wheels, with a strip dominator intake. I will be degreeing the cam and doing the head & intake swap..... any ideas on a hp rating?