Getting a Civic DX, Engine question.

[STRteg]

I know its the Stock DX d15 block, but Im not sure about what d16 head it is, So theres nothing wrong with it? Its basically just more power?

so its a D15B8 block most likely,which has no vtec and perhaps the head swap was done to add vtec to the motor,and it doesnt necessarily mean it was done for more power could have been the only head he/she had to use at the time of the rebuild or replacement of blown head or w/e happened