350 (target) motor mods

[RBR]

Just got a crate 350, had about 30,000 miles on it. Took the heads off and oil pan. Everything looks good. It's a 4 bolt main. I'm looking for a good kit to give it reasonable HP 400 or so. I'm new to the car stuff, so I'm looking for idea's. I've seen DART kits & edlelbrock (sorry for the spelling). These kits come with heads intake etc. Is this a good start. They seem reasonable for the HP and cost of the parts? The motor is a 85 and older block. Thanks in advance for replies