600 Eddy tuning

Got my kit today and changed to the 70x37 rod with not a lot of change. Then U tried jockeying the timing. Retarding the timing to about 5 after seemed to help some but the car is lazy. I started twisting the dist. to advance and Im probably 20 BTC and it runs better but doesn't sound right. Think I'm going to fatten up the jets and play with the timing a little more.