The motherboard will fit your acer case.
About the thermal paste application, if your heatsink has a flat square or circular base, without heatpipes making direct contact, like this: The motherboard will fit your acer case. About the thermal paste application, if your heatsink has a flat square or circular base, without heatpipes making direct contact, like this:
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then it's best to place a small dab in the center of the cpu and let the weight of the heatsink spread it.
But if it's a HDT heatsink:
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It's best to put 3 thin lines on the space between the heatpipes then slap it in.