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?


Mid to low 13s should be doable. I agree with the notion of bumping up to 1.88/1.60 valves. With the higher RPM power that the motor would be making, a 770 SA carb would be ok, if setup and jetted nicely. If I were to be picking the cam, I would prolly back down one level to an XE268 or XE274. It would still have good top end power and and a bit more bottom end grunt, which would be a help with 3.55 gears off the line on launch.