These stock distributers are good to 5500 RPM. You can run them with confidence. In the future you can get parts from Performance Distributers in Memphis to hop it up. The only problen I ever had with an HEI was it blew a hole in the rotor after 35K miles. When it failed to start I opened the cap and changed it. (had an extra on in the glove box) Make sure to use a quality wire for HEI's; a stock one will put out 40,000 volts and higher.
