the 'reliability' issues pretty much went out the door with the demise of twin dizzy motors, you will also find a lot of people with problems do not look after the motor to the correct service specs, ie they use synth oil, dont look after the cooling system, have no OMP etc
bad points are they are expensive to run and noisy. they use a lot of fuel and need constant maintenance, they are not really for the person who just wants to get in the car and drive.
good points are they rev very smoothly and you can get massive increases in power with only small changes to intake + exhaust.
you probably wouldnt want anything more than a large extend port on the street as you wont be able to drive a big bridgey (etc) at 60kmh in 4th gear... turbo is another option but might be overkill seeing as a very mild 12A with an IDA weber and exhaust will make much more power than any NA toyota 4 cyl with similar mods... plus theres the legality issue with turbo mazda motors in light toyotas!