You trim the tip of the input shaft. Lots of guys do this. My 440's crank is not drilled at all either and I'm thinking of running the 4-sp I have sitting around. The longer input shaft tip is not necessary if you use a 90's dodge v8 style pilot bearing that sits in the torq converter register on the crankshaft flange. Back in the 60's and 70's ma mopar used a bushing in the drilled hole, but later went to a bearing and put it on the edge of the crank. I know that swap works for the older mopar V8's, I assume the 5.7 hemis are the same..?