Is a Holley 750 DP too much carb?

No worries I got ya :)

350 Chev is a terrible performance engine. Look at any similar build ups between 318/340/360 to a 350 the mopars always seem to make 50 plus hp more than the 350. Thats until the aftermarket started making great heads for them.

The 350 isn't a good performance engine? There must be some terrible tuners in your part of the world. There have been some very stout iron headed 350's around here.