First time super six swap

Ok so. I take back the great, she runs. So here's what I did and a list off problems.

81 d150 he conversion via classichei.com. non vacuum advance distributor, carter bbd 2 barrel, cast super six manifold with egr blocked off. No choke. Set by hand on carb every times she's cold.
Fast idle set at 1600 cold idle 700. 13° initial timing(I don't know how to find the rest)
Idles fine, cruises and wot on highways fine

But.......

In corners on the highway 55+ it sputters

The pedal is initially very stiff then about 3/8 throttle it frees up very nicely.
I had to bed the bracket for the throttle cable a little to line it up better.

Please help. If you need more information please ask