Holley Carb problem

Im so close to getting my 67 barracuda back on the road after six years sitting, but im struggling with the carb now. My setup is a .030 over 360, rv cam, strip dominator intake, rebuilt 3310 holley 750, headers, full msd with plugs gapped .045. The msd manual says .065, tried it, ran terrible, after further reading went to .045 and its much better. the carb is jetted 71's or 72's I think, stock 6.5 PV. It starts immediatly idles awesome cold or hot, has great throttle response, but it chokes a little at just under half throttle and burns black smoke while revving. I don't have a vacuum gauge but I was looking at the vacuum powered idle/performance gauge on the dash and I got it tuned up to the 18 mark which is the highest point I found while adjusting the mixture screws, but still blew black smoke and studdered a little during acceleration. I don't think its too much carb for my set up, I was hoping it might just need a different PV? what should I try next?