A 289 and 302 are pretty close to being the same motors. A v8 swap will require quite a few things, I think it would be worth your while to pick up a v8 parts car if you really had your heart set on doing this swap. You are going to most of the front end out of that car, tranny, and rear axle. In my opinion your better off to buy a decent v8 coupe, watch around you can find one for not too much money these days. Good luck with everything.