Converting front end on mustang?
The bottom line is you are going to spend time and money, to ruin this car. Not only will it be worth less to the 4 eye guys, but you will be a joke in the aero community as well. A car with an Aero front end, and a carb, is generally red flagged as garbage, regardless of the year (unless it's a drag car).
Aero's are a dime a dozen, find one you like, and offer to trade. You may be suprised that you could barter yourself into a nice 87-93 GT, or LX 5.0... and avoid the hassle altogether.
Just my .02