A local guy has a 63 dodge 426 max wedge. About a month ago I took it for a short drive and when I got back the manifolds got so hot that it bubbled the paint on the inner fenders. I cleaned and lubed the distributor and brought the timing up to 15 degrees initial from 0 degrees where it was. I started it the other day and I used a laser temp gun to read the manifolds. Passenger side was 680 degrees and the drivers side was about 70 degrees less. Is this too hot? If so what should the temp be and would cause this? Thanks