The boring work will be performed to the cylinder block. No head modification is neccesary. Contact the engine machine shop of your choice in your area for advice as to what to bring them. They will prep the block for you, and can also disassemble / reassemble the engine if you like (recommended if you have no engine building experience).
Bill Hahn Jr. 98 RS Turbo: 10.87 @ 136 MPH HRC Stage V with N20 Nation's Fastest Street FWD 2G DSM www.turbosystem.com