I wouldn't expect much more then 5-15rwhp by bolting on the 243 heads, not from flow but from a compression bump. 317 and 243 heads flow the same which is usually around 260-270 cfm at .600". You will definitely notice the power increase because the over responsiveness and low end power are going to change because of the added compression. LQ4 motors have a valve relief in them so they will be around 10.2:1 with those heads on them. Much better then before either way you look at it. Id stay with the 317's and get them ported....
I need an actual description of each pin, thx tho
Again, I'm not the best at reading schematics, I'm mainly looking for wire color and description like AllData states.