TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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I would not bolt on the World heads unless I first ported them. Dart makes a small chamber iron head($660/pair) at 49cc but I suspect that may be too small for a 305cc. Not sure if a thicker gasket would make it work. Something tells me Dart will out flow either choices by quite a bit.
go with 081s. I just picked up a set of 601 heads for my engine, Im gunna start the swap this monday night after medic school and hopefully have it back on the road by the following day. I heard they were a set of good heads as well. I had a set that i spent a bunch of time and money into porting them myself only to find they were cracked so word of advice get em checked out before you start any work on them. Plus you can pick up a set of 081s for like 100$.