Cam - Head - 470 Selection

OK All, Thought I would pose this question and seek a bit of advice.

Working on a 470 build, 440 source kit, predicted compression at 10.4 with 84 cc heads. Block has been squared, line bored, and other usual work.

Motor is going behind a TKO600 and will be used for Auto Cross, Drags, and street fun and cruising.

Question: I plan on using 452 heads which have been surfaced, 2.14/1.8 valves installed, back cut and 3 angle job. When they do this, they hog a bit off improving the flows a bit, not sure how much.

Exhaust is TTI 2 1/8's

As for intake, probably using a super Victor - open plane type intake. It will start off as a carburetor, but currently working on a Megasquirt III setup. This is what I want to build for.

Engine target will be 550ish. Keeping the option open for Nitrous also.

What I am looking for is a cam set up. Predictions are for engine to flow to about 6800. I am looking for long tern reliability and budget, so I believe I would like a hydraulic roller. Here are some of my concerns and thoughts:

1. Heads are the weak link.
2. Fuel Injection - is there a better profile to fit fuel injection? What is it and why?
3. What cam and why?
4. Will a hydraulic roller make it to 6800 without issues

My current cam selections have been through Howards and Hughes, they seem to hit more of the stable profiles with lift, and some with split duration. Cams I am looking at:

CL723235-08: http://www.summitracing.com/parts/hrs-723235-08

SER3442BL3-10: http://www.hughesengines.com/Index/products.php?browse=search&search=SER3438BL3-10&partid=30772
- Hughes, I spoke with Dave, this is the cam he selected.

At this time, I like the Howards much better. What are you thoughts?