Thanks for the quick reply guys. I did not know much about this motor when i got the car. owners family sold it for him while in jail. ran good no smoke no issues except for the lifter. Been eight to ten years. put about two thousand miles on it myself. Timing gears and chain make sense. A 066 or a 067 would suit me fine. Would the old cam give any clues to what it is? One last question. Is it necessary to change cam bearings?
If on a budget, just go with the cam & lifters and new double roller timing chain and gears. In 1967, the 067 is stock for the 335HP engine in 1967 and the 068 is stock for the 360HP engine.
No need to change cam bearings, just be careful removing and installing the cam so as not to damage/nick the bearings. Put a little oil on the journals and just take your time. You will have to break in the cam just as a new engine would, so follow the cam manufacturers recommendations for cam lube and break-in procedures.
The cam presently in the car, if original Pontiac, will have a letter code on the front snout where the timing gear goes on. The letter will ID the cam. 067 will be "P", 068 will be "S".
5-speed conversion is not inexpensive. You will have to modify your trans tunnel if going with the TKO 5-speed as it is bigger in case size and longer in length. The McLeod 5-speed says you don't have to modify the floor. To determine if the 3.55's will work for you, use one of the RPM/MPH online calculators. The TKO has 2 OD choices.
The Dearborn 3-speed is a good heavy duty trans and I have had a couple. I like them. Negative side is that you just don't have that extra gear to drop down into if doing a little street racing when someone comes up on you and you are going to fast to drop into second, but too low an RPM to pull away fast. Great from a stop.