from other posts I read, including Leo Stantucci's book, for street rod its better to leave em in unless you are going to the lumps. I Shaped them like wings as best I could to improve flow but read that any increase in volume is lost by the decrease in air flow if you just take them out.
That is totally false! The lumps always increase air velocity into the port and redirect to flow correctly through the bowl area by creating a short side radius it doesn't have otherwise. We did a series of dyno tests on here on both the 292 and 250, and it was proven that your statement was another one of those "urban legends" that had absolutely no truth to it. A comparably prepped lump head always made more power and torque at the same RPM than a head with no lumps. Also, tapering the bolt bosses was shown to be of no benefit, your just simply not removing enough of it to matter, the remaining boss is still too much of a roadblock in the port. That was another myth that was shown to be just that.
Do you have any pics of your headers. What kind of car are you putting this into.
