I know my timing is not right. Getting on it in 2nd gear, it starts cutting out in mid-range.
I have a '67 bird with a 68 400, 375 cam, 4X heads, Edelbrock Performer and AFB knockoff, and 77 HEI. 4-speed M-20.
Any tips for initial timing, total timing, mechanical and vacuum advance? Haven't found a timing tape for the harmonic balancer.
It's a warm weather (Houston) car.

Schwee, this thread may help a bit:
https://firstgenfirebird.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=23;t=002055

But typically I start it out at about 9 degrees BTDC... But I'm still using a points Dist. So I set the Dwell at 30, initial timing about 9 BTDC and go from there...

I think Vikki's thread above may be closer to your combo, so read the first few entries?

I'm sure some one with better info will chime in soon!

Brett - 67 Drop Top 455!

The first step is to make sure everything is operating correctly. That means the mechanical and vacume advance are working properly. I would like to point out that I don't always practice what I preach and have put the cart before the horse:

I had a timing issue that I had dinked around with for a bit before I discovered half of the problem. The internal part of the hei shaft, the part that twists to advance the timing was seized up. Long after the problem, I have heard here on the board that the seized shaft is a common problem with hei distributors. I don't know the year of my hei because it was a freebee bone lying around, but I belive it is about the same vintage as your distributor.