1st, I would highly suggest just using them sealed and adjusting the box placement so it loads into your vehicle the best it can.
but if you insist on ported... your airspace is actually about 3.87. and your sub displacement is about .10 per sub. so that leaves 3.47cu ft.
34hz.. using external ports,
two 4" ports would need to be 13 5/8" long.
two 6" ports would need to be 32 7/8" long.
if you must use aeros, they'll need to be longer than non flare ports