Power depends on the build and intended use of the car. Along with selecting the correct cam for use. I’m about lower rpm, so I can pull hard out of the turns with a 4 speed. I’m going to be at Laguna in a few weeks and am going to talk to and talk more photos of the transam cars. My brother knows a few of the guys the build and prep them for the vintage races… I’ll take photos of the headers also….