Lineslinger Same for old school ideas, Chaplin is 100%. Has for IMO I have had guys run there motors for 1,000 miles before adding the 2nd spring back in. There is the main reason. Easier breakins. I have done this way once with my last motor. The 452 motor I used the other springs on the shelby heads only and limit the RPM till 3,500rpm. This was after the 20 minutes at 2,250rpm breakin. I changed
oil and filter after breakin, refilled with a can of EOS
oil suppliment, 7 quarts of 15w-40 race
oil. I had no plates on the car and went to E-town on weds nights and drove up and down the track shifting gear and going to 3,000 rpm each shift. I was also running a small hydro cam and had no problems. I also run 100 psi HVHP oil pump. Others here don't believe this is needed. Anyway after the 1,000 miles, install the other springs, drive 500 miles change the oil and filter. Cut open the filter and check for any metal in the filter. If OK, you are good for 5,500 rpm. After 3,000 miles drive semi hard. I would still LIMIT the RPM to 6,200 MAX. After all breakin is gone I would still limit the motor to no more than 6,500 rpm. I think that is the max rpm limit on your cam. Way waste motor.
Side note, if you don't have an accusump, Add one. Use it as a peroiler and if you autocross or like pulling high G turns. It will save wear and tear on startups where most of the wear is caused. Your motor is 15-20 grand, the accusump is $300.00. This is a no brainer.
It may save your motor from major damage, It saved mine. Rick Lake.