The main meet point will be the outbound BP Officer servo on the Princes F'way and plan to leave from this point at 9-30 am.
The main thing needed for you all to bring, is meat for the BBQ's and your drinks.
Longford is a comfortable 1 hr 50 min drive from the meet point. ( Sale is a short drive away ; some 4 or 5 mins).
They have plenty of room for lots of cars and have a large undercover (Garage) spot to congregate, eat, drink and be merry.
If your Mustang is not available to drive down, just bring your daily drive.
Feel free to perhaps throw in an extra chair, some snacks and perhaps a salad to your taste.