I wonder what your car would do with a good set of 318 heads verses the eddy's, as the eddys are too much for the small bore of the 318. I think that you would be very impressed with a good set of 302 heads.
According to Edelbrock there heads flow 232 cfm's @ .400 lift and they claim that they are 171 cc's of port volume, now if you could get the same flow with a 135 cc port runner head then the efficentcy will go up drastically and make more power and torque, also the valve would be smaller. Instead of the 2.02 you would have a 1.78 this will also help. I can say this as I'm running a 318 on 87 octane and NA without power adders and can run upper 10's and lower 11's all day long with stock .040 pistons and a .480 hyd.cam, and the engine uses all factory stock parts. So I know that a 318 is very under estimated as a power producer, I guess thats why I built one just to get to people that have bigger engines, and I don't need race gas.