Racer Brown ST-21

If the W2 heads are the 65cc version, your compression ratio with a .039 head gasket would be 10.9 (that's if your pistons really will stick out .018 ). .045 gaskets will get you to 10.7. .050 gaskets will get 10.5. If they are the 55cc heads, you'll be in the 12's for CR. If your dad offered you W2 heads with T&D rockers, TAKE THEM! Those rockers run around $800- $1200 alone, depending on which ones. If you cut bigger valve reliefs in the pistons, that will drop the CR a small amount more. I say get the W2's, run the cam you have with a .045 head gasket, and have a bad-*** car putting out way more than 400 HP.

I just re-read and noticed the W2's are closed chamber. That means they are probably smaller than 65, so your CR will be high. You'd still be better off going with some RHS or Eddy's than putting the money into the smog heads, IMO.