If ya want some good articles and ya want to see some cool Oldsmobiles, check out 442.com. There's lotsa good info there. When you talk about just the block, F casting blocks have a higher nickel content and are generally found on 72 or earlier Oldsmobiles but there's nothin' wrong with a later block, you just won't be able to bore it as much (which I would not recommend anyway).

Heads - If ya can find E or F casting heads, they're like gold. Off original 442's. C casting heads have the best flow of stock Olds heads (except 442 heads) and are generally found on 70 or earlier Olds'. If ya use these, ya need to make sure that you get leaded valve seats put in them for using unleaded gas. C heads have 2.070-30degree intake and 1.625-45degree exhaust valves if they are from a 4 bbl motor and only 2.000-45degree intakes from a 2 bbl motor. G or GA heads are good 2.000-45deg intake, 1.625-45deg exhaust (in most cases) and are already set up with unleaded valve seats.
I like the idea of going with a reproduction W-30 cam. Just remember, it's not a chevy so bigger isn't better. If you're running an automatic trans, you should know your differential gear ratio and get a cam for that combo. Oldsmobiles do not rev much above 6000 unless you have a lot of work in them (which means big $$$)
Get a deep oil pan and an oil pump pickup that matches your pan. You will also want a high volume oil pump. Olds motor are not good at getting oil to the top of the motor with stock oil pump.
I recommend a rochester quadrajet or edelbrock carb. Stay away from Holley carbs unless you really know how to tune them. My experience with Rochester and Edelbrock are that they don't need much tuning.
I would use a Edelbrock Performer 455 intake for normal street use, Torker is for much higher RPM's than you'll need on the street.
You're better off with an earlier block because it will probably also have a nodular steel crank. If you have a later block, you'll probably have a forged steel crank. If you're rebuilding you're motor and you have the bucks, replace the forged steel crank. If you don't have the bucks, a forged steel crank should work fine.
This will give you around 400-500 HP and will move a 3000 72 cutlass to about 12 or 13 second 1/4 times with a 350 turbo trans and a 373 POSI (roughly speaking).