What are your plans for the car? street manners? Performance? future mods? Should I assume emission testing isn't an issue because you have long tubes? or are they passing?
In general terms ( lobe design has a big effect), lift is actually less important then duration for making power. It's more important to have the valve open longer then higher for top end power, for torque, you use more lift, less duration. But if your furture plans include heads, you might as well go a bigger now.
again, generally, for stock heads and looking street/strip, you want to look at cams in the 220-230 intake duration and 230-236 exhaust duration and makes power in an RPM range suited for your stock bottom end. The big cams like the 306 or GM847 need free flowing heads and the engine needs to be spun up high to make their best power.
The most popular street/strip cams I like are the:
Best street cams, if you just want to add some tire spinning torque: ( 310-320 HP )
Crane "503" slightly better then a GM Hotcam, slight increase in power.
Lingenfelter 211/219 cam.
Street Strip: (320-350? HP)
comp cam "305" = 220/230, .510/.510 on a
112 LSA
or
comp cam "305" = 220/230, .510/.510 on a
114 LSA,
** 112 more lope at idle. **
Comp Cam "230-112" = 224/230, .502/.510 on a 112 LSA. This cam on paper looks to be smaller bases on intake lift, but utilizes more aggressive lobe ramps and a bit more intake duration.
If ported heads are in your future, and street manners are far less important then performance, (350+ HP)
Comp Cam "306" = 230/244, .510/.540 or GM847 cam.
Here is the GM847 in a car that isn't a daily driver any more!
http://www.97transam.com/97ta-cam.php
