I need help with picking a cam for my style of riding. HRC 05/06, sparks, HCII?

[sickboy1]

I drag race, ride dunes, and some trail riding. mainly i want a faster drag bike. (300 ft drags)

I want a drop in cam:

-sparks mx
-04/05 HRC
-06/07 HRC
-HCII

which one?

see my sig for my mods.

from reading past post i have found that the 05/06 HRC cams are not the same,

-What is the difference?

-which would be better for my needs?

-should i stay with the HCII?

i have searched this subject for two days. i just have not found what i am looking for.

any help would be great.

[TRX450R2]

The 05 HRC cam is the best one for you, Rejet main to 185, cut out back half of airbox and your good to go!