New engine issues

It did have a miss with the old stock distributor but went away with new distributor and new gas mixed with 95 octane race fuel. No back fires or pops? Will inspect carb. Will check plug wires on distributor to see if their in the correct spots which they should be. Before I installed distributor I made sure piston #1 was at TDC on the correct stroke and positioned the distributor gear with ***** facing towards the right corner of the cylinder head like in the diagram and installed the rotor to the #1 position on distributor/ cap. When it idles it idles ok it's just when you go to give it gas it struggles. Thanks for your help . I've never adjuithe vaccum advance before either