Starter and possible dist. ?

[chucks70]

When I try to start my truck ('70 350 standard) sometimes tje starter does not engage the flywheel or it kicks out. It may take a few times but i t starts everytime I use it. I just know I'm heading down the road to being stuck somewhere. I thought it was a weak selenoid so I replaced that part. Still same problem. Teeth on flywheel are ok. There are no shims on the starter and haven't been for the 2 yrs I've had it. It started with no problem for the first 6 mos. or so. Any ideas?

The other problem is in timing. I have it set at 12 advance at idle. When I rev it up it approaches 0 and at about 2400RPM it starts back toward 12 advance. Could this be vacuum, weights or something else? Weights seem to move easy enough when pushed out with a screwdriver.