edelbrock cylinder heads
The 318 will be "Undercubed" as far as the cylinder heads "Better useage" could use. The 360 is rightin there. The heads are good in there configuration to about 372-ish cubes for a street/strip type of build.
The heads are preety good and should be checked from there OOTB (out of the Box) condition. I've had my OOTB Edelbrock heads down to the low 12's with a Hyd purple cam. (292/.509) on a 360 4spd Cuda (E-body model) and 4.10's.
The RHS heads are iron and a very good deal as well. Brain (OU812 here) has a shop that works on them for very good prices making them a beter deal then the Edel. heads. He has shown very good power from them.
Considering your build, which is still vauge and general in it's specs, really ethier head would do well. The intended purpose of the engine/car/build could very well help dictate a better path to take on cylinder head choice. In a basic veiw, the Edelbrock head could be veiwed as a head that should perform in a ihgher more aggresive build. It would also cost more.