I started of my B series adventure on my ex teg on B16A then go B18C and lastly B20B. Only sold the car after driving it close to 8 years and the last B20B engine still have one thing which i spent doing up in my B16A. That's the header!! So if you are going on same path as mine before then go for port n polish spend the money to do the part on your header like cams, pulley, valve spring etc as when i go next stage to B18C and B20B it will be still using the same head items. What you need is just getting bottom block to match the header. That's my VTEC rojak lo.... well everyone is rojaking unless your next engine displacement upgrade is straight using B18CR halfcut ;D