Distributor keeps adding advanced without stop?

Just throwing lighter springs on a stock smogger distributor is not the answer

Even if it's right you have at least 38 (8 + 30) which might be too much without vacuum. What kind of light? I've seen "dial up" lamps that were inaccurate and generally refuse to use them.

What I ALWAYS do to an unknown engine is start first with a piston stop and make sure TDC is correct, or remark the balancer.

What are you using to determine advance? Example if you are using timing tape it might be for the wrong diameter balancer.

If you want to recurve the distributor on the cheap, look up FBO Mopar advance limiter plate. These seem to work fairly well for the money.

So far as your problem you need to first know that you have the balancer marked right, and a good timing light. So far as the distro it could be a mix and mismatch of parts...................................................