318 and 833 swap into 72 sedan

I recently posted about doing a complete motor and tranny swap for my 72 Val sedan, and I finally have all the pieces of the puzzle that I need but just need a few questions answered before I get it all together. I purchased a 318 out of an 84 d150 it has a carter thermoquad 4bbl on it and hopefully along with a towing cam for that little extra torque. The truck was automatic and I need to know if it's necessary and how much I would have to cut the input shaft of the tranny and also if a pilot bushing/or bearing would be better for me. The last and finally piece I am in need of is the driveshaft.. I will be running the 7 1/4 rear end due to being on a paper thin budget at this point and would just like to know if anyone could give me a measurement for the shaft itself and if that rear end would hold up to a little heavy driving or if I should drive like a grandma until I can afford a bigger rear. And as far as the stock 225 harness goes will it all be a plug and play or is it going to need a little persuasion? Sorry for being all over the place but that should be all I got, this car is going to be driven nearly everyday and I would like it on the road asap so I can have one less thing to eat at my money. Thank you for your input in advanced.