Hi Tom.
The vin should be on the drivers side frame rail. Yes you will need it to get a fl title.
I usually have a police officer come by and do a vin verification. You can download the form from your local dmv website or go in to the dmv and get one. Might take a few more days to get an available officer to come by, but this way you don't have to leave your car in a dmv parking lot.
The 40-6049 numbers are the head id numbers. Which makes these aluminum stock heads! 40- aluminum 68- iron.
Might want to check vanpelts out too. Tech drawings.
http://www.vanpeltsales.com/
Edit**** Capn John beat me to it :]'