well, if he does it, I might have to also

My 71 datsun truck has the following options, in order of difficulty:
1) L20B w/5 speed (currently has L16, easy peezy)
2) VG30DE(T) w/5speed (aftermarket kit avail. mounts, oilpan, steering linkage)
3) RB25DET w/5speed (who knows what kind of fabwork is needed)