compression = horsepower query

Keep in mind that the NASCAR truck series was limited to a 9.0-1 ratio and made over 700 HP. There intake and head system would basicly be a full tilt operation on a street engine. There cams were roller and valves big for what they did.

If you have even a modest 8.0-1 ratio now, a chamber reduction on the curent heads or new heads will help in the power department.
If you invest in new heads, and your compresion is low (9.0-1 or lower) I would try and stick with an iron head with reduced head cc's.

Port and equip accordingly. A small chambered W-2 is an idea. Now, does anyone know off the top of there head if the W-2's still come in a 55 cc chamber?
That would be a very good option.

You could go from 8.93 to 10.70 with a 20cc reduction.
8.43 to 9.97
8.0-1 to 9.34