That looks about right, especially if the push rod is fairly centered in the hole through the head. Do you have a regular flat tappet lifter to compare against? I guess the seat in your roller lifter could be higher than stock, which could exacerbate the angle. You are going to have a similar angle whether you have TF, Edelbrock, SM, or factory heads. The parts in the heads (rocker shaft, valves, rockers), should all be in pretty much the same position.
I did place a flat tappet lifter and then compared with both the trick flow head and an x head. The lifter height is definitely a main driver into the geometry. I will be calling B3 tomorrow to see what options might be out there