Cut eyebrows both sides, easier said than done, to do it right. I will share with you though , be careful you don't get too wide and break out into the area where you access the cylinder studs. The simplest way for you to boost the compression will be like Al said , get an uncut stock head, but here's where we differ. It's much easier to set the head up in a lathe and cut the .050 relief off of it rather than setting up the cylinder on a rotary table on a mill and machining the sleeve and then the alloy to retain the head gasket in place. No proven performance difference done either way. With the head at zero relief you will use the appropriate gasket thickness to get about .035 squish clearance, gasket thickness will depend on whether the piston is in the hole some or out. The small stock combustion chamber will give you about 7.5 cc's not including spark plug volume, plenty high to wake it up. You will want to back the timing up with the higher compression. Best way to know where to move it would be to put a dial indicator in the plughole, roll the piston to .136 before TDC and make a mark on the rotor right at the edge of the top coil leg, that's the fire mark. The you can take the key out of the crank, slip the rotor back on lining that fire mark back up but with the piston at about .100 BTDC, stock timing will lead to some pretty heavy detonation, If your not gonna turn it past 14,000 or so you can back it up a little more. Carb " bore it as big as you can" well the throttle bore will break out into the fuel chamber at 1.125, a shutter out of a wb20 at 1.100 works real well, then a venturi cut to around 1.025 will leave enough of a V. to T.B. ratio to create a good signal for the high side circuit. Carb alone can make a huge difference in performance and if done optimally should flow 90 CFM compared to 65 CFM out of the stock WB3A. You need to bore the alloy and phenolic as well as match the port to throttle bore size. You'll be surprised how strong it will be if your used to stockers, and before your done you'll understand why a real one cost so much. Jon