gonna install a big motor and discs, help needed.

[Pumkin Truck]

Hey everyone, i recently picked up a front end from a 72 gmc with disc brakes. I also got the brake resiovor,if thats what you call it?(thing infront of the boosters) I think the swap should be fine. My questions are: the big motor is a 76 500cid cad with the 400 tranny. Anyone here ever installed one of these monsters in our trucks (my truck is a 69 gmc swb stepside with a wimpy six) from the looks of things i know that i am going to have to alter my driveshaft and fab motor mounts, do you think that the stock rad with electric fans or the fan from the cad will keep it cool and would i have to tear up my floor to fit the tranny in place? thanks for the much needed help. pumpkin truck.