13.5V constant ouput OR regular voltage regulator???

hey there, so i'm am pulling my hair out because it seems that everybody has a different answer to this question... i'm running a MP electronic ignition kit with an MSD blaster coil and i need to buy a voltage regulator...i've heard that the constant output 13.5V (MP 3690731) is great but its "for race only" according to moparts, summit, jegs etc. supposedly it will fry the battery and make it boil. so the other option is the MP 4529794 which is just a typical restoration regulator(fluctuates voltage). basically, will a constant 13.5V harm anything??? this is a street driven car that rarley see's the track but often see's night driving where bright lights are necessary!