Well i found this fancy program on comp cams web site called Canquest. Lets you put in info about your ride such as truck, weight, purpose to be used for, motor and some other things and this program is free to download. SO after punching in some number here is the cam im going to get for my lil 5.3

Comp XER273HR

intake duration = 224
exhaust duration = 230

Intake lift = 581
Exhaust lift = 588

LSA = 114

i also think this cam will work well with spray because of the lsa and the extra lift and duration on the exhaust side...... Smart asses chime in here