FSV Air Cooled Questions

Hi All, It's been awhile since I have been back in the Formula arena and have some questions regarding the Air Cooled FSV series or lack thereof. Is there a showing of these cars in the NE and are the Air Cooled cars even running anymore? I have a chance to pick up a Lola T328 roller and was wondering if it was better to go with an air cooled or water cooled engine. Also what engines, size, and typical HP are being used. Thanks for the help, Allan