when tuning a performance engine, tune ignition first and then tune your carburetor. 4secondsflat has a website and offers a tuning book that is really easy to read and will teach you what to look for in a print medium. In the old days (1960's) a speed shop would use a distributor machine and...
Assuming not positraction, Jack up rear axle and block one wheel...put in gear, slowly increase speed to see if vibration occurs and repeat for other wheel. If posi, remove one wheel ,install lug nuts and repeat procedure to rule out tire problem.
I am by no means an authority on this subject but, our cars have some weaknesses in the electrical system... especially at the firewall connector, examine this point for corrosion and heat damage, the amp gauge is often by passed and there are articles showing how to do this...the instrument...