Just 4100 RPM... for a 318

Check that you've got good fuel flow to the carb and that your fuel filters are not plugged off. Also your timing chain could have jumped 2 or 3 teeth but usually when this happens the engine is very hard to start. A quick check of this is remove your fuel pump from the chain case and reach in the hole with your index finger. You'll feel the chain just around the corner about an inch inside and the chain should not have anymore that 3/8" movement back and forth.

Terry