350 hp out of a 302 makes me think you will have to wind it up a bit to get that power. Possibly not great low end. I honestly don't know.. If it's just heads cam and intake, I would also compare the cost of a set of AFR heads, that intake (probably a rpm or air gap) and whatever cam you're interested in. I'm thinking you won't be too off from the Edelbrock kit price and the AFR heads are better.
A little story-
I had a 393w in my '95 mustang GT with Edelbrock heads. Way under cammed so it would pass emissions in California. Anyway, on the dyno, it didn't make the power I had expected. Also, the Edelbrock heads were milled for higher compression (about 10:1 I believe). I was so pissed, I went out and got a set of AFR-185's (also considered a bit on the small side for a 393w. By changing nothing except the heads ( and on the same dyno) it gained over 40 hp to the wheels. Also, the AFR heads were not milled so ended up losing compression. I'm not saying AFR is the best (There's a lot of heads out there). Not am I saying Edelbrocks suck. I just know for me, AFR's worked out better for my street driven engines.