Edelbrock Heads for 318

Here's what I'd try...
sell the street dominator, pick up an Edelbrock Performer 318/360..the small (318) port version of the Performer. I'd run a Thunder AVS p/n 1806. 650 cfm, electric choke. For heads, if you have the early 318 heads, the small open chamber ones...Run them. I have a set of mildly ported ones on a 360 of mine. I added the 1.88 intakes and 1.60 exhausts with hardened seats. The smaller chamber will help add compression. In the US, these heads were IIRC '68-'71, but I dont know the casting number. I wouldnt enlarge to 340/360 size, I just gasket match them and the intake, and smooth out the bowls and transition areas. For a cam, sticking with your "solid" thinking, the Comp Magnum 270S is a mild single pattern solid that would work well. I think the 268S will be a little big if you run power brakes, and need pump gas compression. My first choice would be the XE262H, and a true static compression of around 9.5:1. For ignition, the MP vaccum advance distributor and either an FBO or Std Ignition module would be fine...Or the MP running a MSD 6AL.