do it right, strip the whole thing. One pet peeve of mine is to open a hood of a Z and see a different color. Thats a complete turn off for me. If its worth doing, do it right. If not leave it red. Silver is nice, but there are many other nice colors also. Go to the new car lots on a Saturday and there are some bad ass colors on the new cars. I've held a spray gun a bit and it is sad to not do a thorough job after all the hard work..good luck on your project.