I have a 74 nova with a 350 in it. The car has 4.10 gears and a 3000 rpm stall. It has flat top pistons. A 292 cam with 234 degree at .050 and .488 inches of lift. I am going to put a set of Dart iron eagle platinum heads on it. 200 cc 2.02, 1.60 valves and 64 ccs. The intake will be a victor jr. The carb is a 750 holley vacuum secondarys. Where should I start with the jetting?

Just keep the Holley factory jets for startup. Once You've got the timing set and all, look at the tailpipes. If They're sooty and black, use smaller jets. If they're white and dry, richen it up a bit ( bigger jets ). What You want lo see is a tan color in the tailpipe. You need a starting point on the jets and the factory has already put a safe size in there for You. Don't try to out think the engineers.

Here is a good place to start
I would get it running take a Vacuume reading and get the proper power valve to start.
http://www.mortec.com/carbtip1.htm