I don't personally feel that 1x fan and a half-size radiator is 'enough', but I know others do it successfully. I believe in overkill myself, and have: a (fullsize) fluidyne radiator, flexalite fans, dei heatwrap, 160' thermostat, higher radiator cap, etc. You can also remove the relay for the fans and can run a short 2" wire to have them run all the time.

You can buy a cheap little tester from walmart/autozone/etc that tells you if anything is in the coolant besides coolant.

- J