If someone said they were going to throw away the POS 260/5speed and replace it with a built, FI Olds 455 with a T56 would you sell the car to him?
Some things aren't around anymore because they've outlived their usefulness.
People come up to me all the time to tell me they are disappointed my 2+2 doesn't have a "Pontiac" motor in it. Their disappointment should be with GM. GM is the one that put a chevy motor in my car. I just put a better Chevy motor in it.