you are going to see a trend

first one was a ford 351
318
318
225
360
318
12v cummins
24v cummins
350 chevy (towtruck)
12v cummins

got the last 4 still and the last one is recently aqcuired, i personally like the 12v better than the 24v but both 12vs are 5speeds and the 24v is an automatic, if i had a 24v as a manual i might change my mind, also the 225 i believe might be as indesructable as the cummins