The 383 I built recently for my nephew's 69 Roadrunner got a Comp Cams 284 duration hydraulic cam, don't recall the lift right now. We installed full-roller rocker arms and did some basic pocket porting. With the original intake and Carter AVS carburetor, it dyno'ed at a bit over 400 HP. No radical idle lope or driveability problems, just enough fender shake to let folks know it could get nasty if necessary!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!