Shake out the problems:
Oil leaks, fuel leaks, loose bolts, valve adjustment changes, clutch and adjustment settling in, drive train noises, battery hold down clamps getting loose, headers bolts not tight, header pipes hangers loose or missing, pvc hose popping out, wires loose. Man you could write a book on 'shaking it out' just from reading Club Cobra!
BUT, if your good, really good and you trust your work, put 500 miles on it and drive it like you stole it! You could shake it out 1/4 mile at a time.