Holley 1850-5

Actually I now think the carb is fine. I just went through the motor, 20 over KB pistons ,Same crank, same cam, Eddy heads 60175, Motor sounds good at idle but acts like a severe vacuum leak or like timing marks are off. Stalls , won't accelerate properly. I know I aligned it correctly for stock setting. Timing is at 8 BTC 35' Total. Motor was tired but ran good but sat 10 years before rebuild.New Gas tank and stock fuel pump . I have 15 in. of vacuum at idle .Not sure if this is low for stock 1968 4 speed cam but can't recall what it use to run at . Comp to me is little high at 180 . In the process of moving so it's been hard to get to work on it. Have no Mopar mechanic friends to help .
If it were me I would try 15° initial timing or so and see if it likes it. If it kicks back against the starter back it down a degree or two. If it pings you can usually tune that out with the advance and the total mechanical advance in the distributor. Once you find that happy initial timing, you can always pull the distributor and send it out for a custom curve. I don't ever remember running a Mopar engine at stock timing specs and never less than 10°.