You can run the stock lst2 pipe with either lrp motor. It is a good all round pipe.
The pullstart lrp spec3 can take the losi spin start pretty easy.

Here is the holy grail for the lst2

http://lstforums.com/forums/index.php

All the info you could ask for.

I don't recall what run times were but with that big lst2 tank you have plenty of mileage.