you do need to drill and tap for a pressure nibble on the side of the carb....if I can do it anyone can....picture is quite clear on location. Tom recommends rotating the carb so the arms are at the top, I did so (minor rebuilt of throttle and choke connections from servoes) Kit includes a new reed block - thicker to hold the V shaped double reed, and reed block is pre-drilled with pressure nipple installed.

Immediate increase of 200 RPM but I'm still running a bit rich