I know this is an almost impossible question to answer but thought I'd give it a shot. I have a late GEN 1 350. It has a bit of a cam but since I didn't build it I have no clue about the specs. Its running stock manifolds, no headers. Its running a 725 cfm type 4150 # 4118 Holley on an Edelbrock dual plane manifold. The engine has been running rich since I got it. I'm planning a LT1 swap so I haven't really addressed the rich condition. But now I've decide to attempt to fix it. The plugs don't really look that bad, a little dark. I looked at the jets and power valve, they are the ones that come stock with this carb, 725 (F)68,®78 power valve 8.5. Obviously whoever built the engine didn't do any fine tuning. I don't have an exhaust analyzer and doing all out runs on the street and plug reading isn't something I'm going to get away with where I live. Is there a best guess for jetting this carb with what little engine information I have?
I hate to have to buy a whole jet kit for this to shotgun it. Summit wants $42 for a whole kit and $7 for a single set.