Jay I dont know if your car is a v 8 or 6 cyl but to swap a 351C for the stock 260/289 is very easy. If you have the v8 car you can use the stock motor mounts .The other thing is that you need a 6 bolt trans such as a C 4 to use with the cleveland. I think that a C4 will even use the stock driveshaft after you switch the yoke to 26 spline. You can also use a 4 spd top loader if you want . I have done the swap , I have a 64 Fairlane that was a 260 auto w/8' rear and I have swapped the 351Cleveland in using stock motor mounts and a 4 spd top loader using a Lakewood scattershield and the stock trans mount and crossmember from the 2 spd auto trans ...all just bolts right together....I also used a 289 4 spd Mustand yoke and a driveshaft from a 77 Thunderbird that is 56 1/2 '" long .I also had a 9" rear housing made to fit the stock springs 38" c-to-c and the housing is 52.25" width so it uses the stock axles and brakes from the car.The last thing is exhaust ... I made a set of headers ...anybody can! that is anybody who wants to can .... need any more info or pics just e mail me