Best 273 and 318 builds (NO 360's please)

The build I am planing is:

KB flat tops(forged)
273 Forged crank
Unsure about rods, may reuse if it is cost effective.
XE284 cam, I know it is big.... I'll see how it runs then might step down if it is too much.
302 Heads for starters, I want to at least bump them up to 160 Ex valves. They will have a simple bowl blend as well as some port matching.
As for the intake, I will probably run a smaller port for now with the 302 heads(I have some decent ones), then most likely RPM air gap later down the road when I want more power and have better heads.
I want to run these rocker arms:
http://www.hughesengines.com/Index/...a2VyIEFybXMgJiBBY2Nlc3Nvcmllcw==&partid=22765
I really want to run 1.6 ratio but I am going to have to do for research first because that will be a ton of valve lift especially with an xe284 cam(544 to be exact)
Carb, maybe 670 street avenger, anybody think there would be much loss running the 770?

Transmission is a mild 904, going to get a 3000 stall. I have the lower first gear in it as well.

Rear is 8.75 with 3.55s

Looking for quick mid 13s... lol what do you guys think?