Pilot bushing for 4 speed swap

so just bought myself a 68 barracuda with a 318 904 and 8 3/4 last week. I wanted to do a 4 speed swap and came across a barracuda with a 340 and 833 for sale near me. It was in really bad shape so I called the guy and asked if he'd sell me the trans and all the linkage. Surprisingly he said yes so I got the trans, shift linkage, clutch linkage, bell housing, pedal assembly, column, and driveshaft. Now here's where I'm confused, since my car was originally an automatic, will there be a problem? I have heard that I either need to cut off an inch off the tip of the input shaft, I've heard that the trans will need to be completely disassembled and the input shaft will need to be taken out and machined down to fit in the crank, I've also heard that I will need to pull the crank out and get it machined to accept the input shaft. I have been doing research non stop for like 5 days and keep finding deifferent answers and Brewers was no help at all. Anyone with experience who could give me advice would be a big help. Thanks!