I have tossing around the idea of throwing a 12v in my 1998 1500. I have acsses to a motor and transmission. What would I have to worry about? Would i have to beef up the frame and suspension, i will not be towing anything. Will it bolt up? There is a 5.2L 318 in it right now. Thank you!

does a cummins engine bolt up to a gas transmission ? or would I have to get another transmission? whats the best engine to go with in this conversion a 12 valve or a 24 valve?