i just put the holley g180 on and will b fine tuning tomorrow morn. i have noticed u guys say that u muck around with the timing after fitting the 32/36 is there a reason for this? is it because of the amount of feul/ air being sucked in now or is there a optimum setting for a type of performance bolt on?

I kept my timing stock. After you get the carb tuned in, then you might try advancing the timing a little (just before it pings).