340 whiplash vs. voodoo vs. thumper

I like Comp Cams, and run the XE268 in my 360. The car runs very well with it.
Having said that,I think with your setup,I would bump up to the XE274.
Give Comp Cams a call and ask them what they think. Be ready to give them all the information on your car(motor,carb,gears,4spd,tire size,weight,ect)I bet they chose the XE274. Let us know what you decide.