Get some sand, take off everything attached to the throttle body so you can get unrestricted access to it, start the engne, rev to 6000rpm and feed the sand into the WOT.... :lmao:
oke:
Seriously, as already said unless you have the correct tools have practiced hand porting heads... it's going to be difficult and possibly stuff the heads up. Also head work should be in conjuction to other mods like a CAM and the head work should match which does take a bit of knowledge.
There are plenty of article on the web(
Google is your friend) and if your really stuck on doing it yourself get yourself a pair of second hand heads from a wrecker and go nuts.... this way of you stuff them up you can always put your orinigal back on.