[Longhorn Man]

yes, there are 2 styles, the common 68 - 71, and the one year only 72.
The 68 - 71 are a dime a dozen...maybe not quite that cheap, but cheap none the less. However, the motor mounts will cost you.
The 72 style, the frame mounts will be stupid expensive... but the mounts are dirt cheap.
The later style is prefered, stronger set up.
Although, since you'll have headers on your big block, you don't even need the proper mounts and towers... you can use small block stuff and no one will ever know.