I would not call your Malibu a Day 2 car. If the tach is kinda old, then it may pass. Tommy has some nice old Autometer ones that kinda look like their current offering, but are from the early 1970's. Just trying to say you're not obligated to run a Sun tach to be "Day 2".
If the intake is in old design like a Edelbrock CB3, then you are getting warmer...
How about the Holley, what one do you have?
How about your wheel/tire combo? Care to share some pics?