Without question do the 402 specially if you want to still be competitive...Well more competitive then with the blower. Heat soak sucks so does the added weight. Also n/a motors are great for the track if cammed right and built right. You should hit up Ryne at CMS. He is like the so cal god of lsx motors/cars just pick his brain.
Their website sucks but he is into making gm cars faster not websites lol.
http://www.cunningham-motorsports.com/
Ryne Cunningham
Cunningham Motorsports
Specializing In Late Model EFI Performance.
Lake Elsinore, CA
Shop: (951)471-2898
Cell: (951)375-2453
Ryne-CMS@Hotmail.com