all right...either way u gotta shave the top of the head completely flat...probably get a shop to do this cause u'll regret it if its not flat...make sure u leave some meat on the head so u can tap and bolt an aluminum block to it...basically all u gotta do after its been milled flat is cut an aluminum block to size with the head, and is about 1/4" thick...its fairly lengthy to explain so i'll direct u to my website...u may find some other interesting stuff as well...but most importantly check out the link called 'inline fever'...go through his stuff cause he has some homemade things which are quite neat...i assumne u know where the link to my site is on the thread...otherewise just type in:
www.geocities.com/davevandrunen/index.html