there sure is plenty of room in there.. you'll need stiffer springs and shocks... as far as motor mounts (easiest way) Find where the mounting points if any on the engine are and weld some motor mounts onto the geo. You'll probably need actual mounting plates instead of the rubber block the geo currently has. If you go mounting plate you'll definatly feel alot of vibration. But it would be fun. I'm trying to imagine the Ls-1 engine in my camaro in the geo... wow..bye bye drive train.
Then you'll need a tranny to attach to the 350 as the one in the geo a) won't fit and b) would blow itself up internally.
Definatly need upgraded drive shafts and differentials with something a little more bullet proof.
Go with a carbon fiber drive shaft specially made and probably 35 spline gears into the differentials.. then the only thing you would have top worry about is tipping.. so buy some wheel spacers and polyeurathane everything on the GEO
