Just my Imagination....
Imagine that you have put 1000 dollars in a race. You have a Cougar 85 V6 and going to race to a mmm......a Nissan Sentra 2001. You had good races with the 3.8 and woooops ! the 3.8 had a blown head gasket and the race is in 4 days. Your options are:
1) Fix the 3.8 and modifiy it as possible.
2) Take out the 3.8 and put the 1989 5.0 V8 from your brothers truck. Its easier the swap.
3) Throw the 3.8 and put the 2001 4.2 V6 from dad´s truck. Its a hard swap.
4) Forget the race. Run away with the money !
What will you do ?
Remember, its only imagination.....