I haven't seen the car do it. He says it happens part way through 2nd gear. It's a small tire car (not radials) with caltracks. May not even be shake. I personally have never taken it down the track to feel it.
It's a blue 69 sb nova twin 76s on it.
He's in the process of a efi change from My old electromotive system to a holley dominator system. With all the extra inputs for logging, we should be able to see whats going on and get this thing haulin.
It's a real nice factory paint "mild" appearing car. Mostly street driven, pump gas car. Been deep 9s, wants to see 8s. Should be out fairly soon.
I sold my car a while ago and live vicariously through working on his.
Bad pic but here it is.