stumped!

Try blocking off the fuel hose and spraying starter fluid down the carb throat (hold throttle open while spraying, then close). If your spark is close (say TDC to 30 deg ATDC), it should run on the starter fluid. You can keep giving it shots to keep it running. That would tell you if it is a fuel problem.

When you installed the cam, did you have the two dots closest together and on a line between the center of each sprocket? On a small block, the dots align when #6 cyl is at TDC compression. That confused me at first. Did your "timing set" have multiple keyways to choose from. If so, those can be confusing and the different dot symbols can be hard to distinguish.