I think, with as little real load I put on the van, a stock tranny with towing valve body is the ultimate ticket. It is probably dried out internal seals. It has done this from day one, three years ago.
I have contacted seveal roller rocker manufacturers. The one from summit mikes out to 1.52/1 consistantly. They also caution on using the 1.6/1 rockers. They rub the head with the pushrod on occasion. That is not too my liking, and I am not ready to pull the heads yet.
I am giving consideration to replacing the 600 EGR Edelbrock with a Q-Jet. It always feels like it needs a tune up. It also does not have a smooth power transition from start up through cruise.
I think I am going to go with 1.5's and maybe a Q-Jet. I am not sure.
You guys are really helping. I appreciate it.