Should love to have a Dino, but instead I have a 1970 MGB! Point of this post is to say I fitted a remote brake servo not long ago, obtained from the MG Owners' Club (here:
www.mgocspares.co.uk ). Don't know if it would suit the underbonnet space in your Dino, but the guys on the MGOC spares desk are mighty helpful on the telephone if you want dimensions, etc...