If you're stuck on getting a Clamshell and bothering to import one, go for the Chevy w/ the 454!.
Like this deal..
http://cgi.ebay.com/ebaymotors/chevrolet...SRCHQ3aUSQ3a101
Cool cars but I had my fill of clams when taking my apprenticeship as the local funeral home had a few Clamshell hearses we'd service and guess who got stuck lying in the back pulling headliners and fooling w/ the upper window tracks etc..
~ Pete