I love posts like this.
Because you say you can run a S1X with higher lift rockers and don't need milled guides...but running a Thrasher Cam you need milled guides...considering the lift on a TEP cam is quite less than that of an S1X with higher ratio rockers.
Get your facts straight.
This is why I comment on your stuff, its all wrong. Also, it performs better than my XP did...and it IS a nice higher RPM performer where the 3800 lacks quite a bit, especially on a blower build. You also do NOT need #150 springs; I'm running 130's. They did the job quite fine. Reptile is running a cam larger than the TEP and he is using a stock chain/dampner...the ONLY reason I ran a double roller was to let the car idle super low. Dave is running 130's and a stock chain/dampner on his RWD 3800 build.