cutlass

So in my 76 cutlass supreme I recently got a new head unit (custom autosound usa740) it says it outputs like 300 watts and was wondering what a good set of 3.5 inch speakers for the front and 6x9s in the rear. I would like to hold up on getting an amp for the speakers so I can spend that money...

Hey guys, I have a PG QX4150 amp and a 3 10" sub enclosure built for my car.I don't know wattage/rms very well and need some help find the right subs or different amp to power my system. Thanks.