I would replace your whole system since it's almost a decade old (reuse the GTX 660), but with a $190 budget it'll be tough. You can try building a budget Intel build with a Pentium G4560 (4 threads) for $75, 8GB DDR4 for $55-60, and a mATX motherboard for $50-60. That would be around $190.
I'm pretty sure the Core2Quad will bottleneck the GTX 970.
ok, uhm, can i ask if I can play battlefield 4 with that processor, with no stutters even multiplayer? 32 vs 32.