Join Date: Jun 2003
Location: Winston-Salem, NC 27040
DarkHorse performance is another good source. As is NPD and Dallas Mustang Parts and CJPony and...
By the way, if you have an automatic, you will have a flexplate, not a flywheel, as flywheels are typically incompatible with torque converters... :: In addition to the parts you mentioned, you will need either a new waterpump, radiator, and serpentine pully system OR reuse your existing early 289/302 waterpump, etc with a 3-bolt harmonic balancer from NPD or other supplier. If you use the fuel injection, you will need a new fuel system (electric pump, return line, gas tank, etc) and likely will need to relocate your battery to the driver's side.
Unless you will be happy with the existing power of the 86, stay away from the 86 5.0 as their "high swirl" head and piston combo means that you have to do a lot of parts replacement to get any above-factory power. There are a lot of sites on the net that will step-by-step you through the process and give you an idea of the expense and skill involved.
It is easiest, IMO, to find a 87-93 Mustang with a 5.0 and swap out all the parts, particularly if you are going to use the fuel injection and the AOD (overdrive automatic).
Good luck, and do a search here for more info.
Currently enjoying my grandfather-in-law's 1966 A-code coupe. I am the second owner. Ü