What Next?
What I would (and did) do with a car in your current state: 3500+ stall speed torque converter, subframe connectors, Nitto NT-555R drag radials, Trans-Go shift kit, transmission temperature gauge and a transmission cooler. Possibly "basic" tuning for shift points and torque managment.
The stock converter is a piece of crap when it comes to performance. If you want to get the F*** up and GO put a converter in right now.
If you want something cheaper and simpler that may or may not give you a significant SOTP gain (but you want eventually anyway) an LS6 intake manifold and/or underdrive pulley is not a bad idea.
Based on the drag car listed in your sig I am surprised you havnt put a converter in the Z yet....

Cam swap isn't very hard. If you have somebody to help you, basic mechanical ability and all the right tools you can do it yourself.
See sig.
Did you read hte link in my sig? Try www.ls1howto.com for a complete cam swap guide. Its really not that hard. Removing the radiator gives you the necessary room to work.
Not all cars dyno or run the same, even with identical mods, but there are a lot of cams that will get you to about 400 rwhp. The MS4 is one of them. With the right gears/converter I would daily drive an MS4 (I alrady do it iwth an MS3) but not everybody agrees with me on that. Streetability varies from person to person.
If you search, read the stickies, search some more and do a lot of reading you should learn enought o make a good decison on what cam you want by the time you ge that far.
The Best V8 Stories One Small Block at Time
It only gives me any notable problems when it is cold outside. It didn't care for the 5-15* temperatures we had a couple years ago. It had to run for several minutes before it would idle smoothly in gear. Until that time I had to hit the gas and brake slightly while in gear or put it into neutral and feather the throttle (only while stopped). Since it isn't normally that cold it doesn't bother me much.


