might do that when i fix my truck after last weekend , the throttle servo arm came off ,truck took off flat out till it hit a car [parked] followed by the front of a house.
well it proves one thing for me , tough truck only broke rear drive shaft.
when its fixed i plan on first new bearings and crank ,drive it till it needs new piston and sleevr then do the new .18 conversion.
let me know if u do the changes and how u get on

cheers for info
madmark