[chrisguyw]

Also I'm using 6649B medium chassis so is rt3 or rt4 motorpod best? It will have spring suspension fitted too so which should I use?

As you are using the SC-008 (20K motor),......there is actually very little to choose between the RT3 and 4,........the 4 is a touch stiffer, but the 3 is more than stiff enough for the 0008 motor, and, if adding ballast is in the cards, the 3 is easier to add weight to.

The choice is yours, for your motor, you very likely will not notice any performance difference whatsoever.

Out of curiosity, why are you wishing to run an anglewinder pod ???,........Scaleauto makes RT3 sidewinder pods for the FC-130 sized motors, in 2 offsets. These have the same bolt/screw patterns as their anglewinder pods, and will bolt right into your chassis plate. They are part #'s 6526C and 6528C

Cheers
Chris Walker