if you souped up the old 6 it could definately be worth it. check out
www.cliffordperformance.com and
http://www.mustangandfords.com/techa...283/index.html You're going to spend more money on performance parts for the six, but may save money on not having to swap out all the stuff associated with the 6 to 8 swap. You will have to swap the rear end though, i broke mine when i still had my 6cly in!!