350 timing

[hwiggles]

Hi Chevy Owners,

I just purchased a 68 Chevy C10 lwb with 350 400 turbo trans. I was trying to tune my truck up with the information I got off a Chevy web site that shows the dwell at 28-32 deg and timing at 4 deg. I was told by the previous owner thatit was 12 deg timing. Which is right??. Also after i set the dwell and timing, I would rev the engine up and then watch the timing markwith the timing light and it took a while for the mark to get back down to the 4 deg I had set it at(could it be a bad distributor?
Thanks hwiggles