You would notice improvement if you get the best C2Q CPU ...Q9650.
Or at least Q9550.
If not, then there is no point in upgrading.
But Fx 6300 + Gigabyte Mobo + DDR3 RAM is a better deal for almost the same price as those C2Q CPU's.
You need socket FM2 motherboard
http://www.flipkart.com/gigabyte-ga-f2a55m-ds2-motherboard/p/itmdgb8c7u4a95tk?pid=MBDDGB8YEHEBCYBD&otracker=from-search&srno=t_1&query=fm2&ref=9fdce536-3825-42eb-b298-66e7921daa0f
That PSU is junk...
"AMD FX-8350 is massively better than the Intel Core i5-4570 3.2GHz when it comes to running the latest games."
http://www.game-debate.com/cpu/index.php?pid=1194&pid2=1140&compare=core-i5-4570-3-2ghz-vs-fx-8350
http://www.tomshardware.com/answers/id-1707031/4570-8350.html
Replacing the stock one is not necessary if the CPU is not overheating.
http://tinyurl.com/qjownxs
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099
20,000/- will not be enough.
FX 6300
Gigabyte GA-78LMT-S2PT
MSI Radeon HD 7750
Seasonic SS400BT
4GB DDR3 RAM
Even this is not a good gaming or animation machine, but your budget is so tight
Look for another rig. For motherboard, Asus, Gigabyte and ASRock are preferable.
For Power supply, Seasonic, Corsair or XFX.
http://www.hardwaresecrets.com/article/Logisys-PS600A12-Power-Supply-Review/1211/9