ALWAYS remember, bigger IS NOT better. Don't overcam or overcarb. Those are the two most common mistakes people make.
You don't say what you will be using the car for or what your budget is, but here's my opinion for a strong street motor:
heads: good set of aftermarket. World Products makes some good iron replacements.
There are a lot of good aluminum heads on the market, you pick. Stick to 195 - 200 cc intake ports for the street. Bigger valves don't do much good until 6,000 RPMs, so save money here if you can.
compression ratio: 9.0 with iron heads, 9.5 with aluminum
cam: Something similar to a Competition Cams 268H, MAYBE a 272H depending on what you are using the car for. If a daily driver, stick to the 268H. I've had the 268H in two engines, a 327 and 350, and really like this particular grind.
carb: stick to 600 to 750 cfms, with 650 being just about right for a 350. Edelbrock vs Holley is your call. Everyone has their own preference.
intake: Edelbrock Performer RPM or Holley part# 300-36. Both are dual plane. They are virtually identical, so get the one you find with the lowest price.
ignition: Get an electronic distributor or convert your points to electronic using a Pertronix kit. This is more to reduce maintenance than performance. I have used MSD ignitions (6A or 6AL) on all of my street rods. It is optional though.
headers: stick to small tube headers (Hooker Competition instead of Super Competition). You'll have fewer potential interference problems. Again, the extra size doesn't affect horsepower until 6,000 RPMs, so why bother?
extra: put forged flat top pistons in and get a 125hp nitrous system. The above should make a good 325-350 hp and the nitrous will get you over 400.
This motor may not have the most peak hp, but is will have a lot of low end grunt. That's what you really want on the street.
Hugger Orange & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt
[This message has been edited by gheatly (edited 03-09-2000).]