d15 vtec

Hey guys, so im currently halfway through my engine build. Its on a well maintained D15b2 block with a D16z6 head. Im swapping my mini me out for this fresh one that should be bringing me some more ponys because when i bought the car the seller told me it had a bad cylinder. VERY TRUE. Months...

im bying a 00 civic with a d15b7 block ( i checked) but when i drive it, it definetly has vtec and it says so on the head...is it possible the head has been swapped? the current driver does not know.. I need help before i buy this and find out the motor is bullshit. he is asking 4000 for the...