a very short wheelbase and a narrow track width on a vehicle are two things that automatically cause handling issues with lots of power added.
slowing the steering ratio down helps considerably, as well as a small diameter steering wheel.
7-8 degrees of positive caster helps make the car go straight[er] than anything less, add 1/2 to 1 degree of negative camber and 1/8 to 3/16" [maybe 1/4"] of toe in to help [a little] when car gets out of shape.
all measured at a chassis "height" rise of 1 to 1 1/2".