The PP bolts,, I would replace them all, get factory ones (from a vendor) or get the ARP bolts, they are the best even for a stock replacement,, it is a 66 and hard to say how many people have been in there so do it right and get good hardware,, Ram clutch should be a good one,, I have never used them but Summit sels good stuff,, bell housing bolts,, wont be a problem,, but again I would get new hardware as well,, I did not see on this post but I highly, HIGHLY recommend to remove the flywheel and have it resurfaced,, I ground flywheels (and crankshafts) for 10 years and I have seen what looks like a "good" flywheel and it had flat spots, wrapped ect,,, and look at the ring gear (where the starter engages teeth) and any wear have the machine shop swap it out as well,,, I am a firm beleiver in taking the time to do the job right the first time,, and my 66,, well she will get all the above before I throw the drive line back in,, 66`s rule!!!!!! Matty man