I havent had time to find out yet. I have been fighting a valve train noise for a long time. I also had a miss [MSD coil sure tickles lol] and finally located it. The pushrods were touching the guide plates. 2 sets of busted comp cam guide plates and a dremel tool finally fixed it. To make a long story short some thing or wrong adjustment some of the valves were not sealing.So friday I pulled the heads and the machine shop redid the heads. Monday afternoon He is going to adjust the valves and the hopeful tues or wed a local shop with a dyno is going to do some adjustments. I do know the motor reuns better and starts easy. I tried at one time to get a gas milege figure from some people with FI here on the forum and had no takers.Road kill did a 55 Chev gasser with a hemi, and they started at about 7 mpg and got it up to 17 mpg. I liked that episode! When I find out more info Illget back to you.