No_Vaseline
What kind of 400hp car do you have?
Mine was a Superformance Cobra repro with a Ford Racing 460 crate motor stroked to 522 cu. in. We lowered the compression to 8:1 and ran well on pump gas. It was in a 2200 lb car with no techonology. Hi hp/torque and short wheelbase was very interesting.
Roll bar, fuel cell, 5 point belts got some interesting looks from the PD.
I opened tracked it for a couple of years at California Speedway, Las Vegas, and Willow Springs.
What is the Sportsman Motorsports class you mentioned?
Go fast - Be safe!