I'm looking for low/midrange power. I dont need to go over 5500 RPM and risk breaking parts. The Vortecs, I believe, are much better for midrange because of the smaller (170cc) intake runners, rather than the Sportsman IIs 220cc. Am I correct in this assumption?

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'83 Firebird 2.8
'89 Firebird Formula 350
2nd owner, red/grey, t-tops, dual cats, and a 3.27:1 rear
K&N, TB bypass, No MAF screens, CAI, full Accel ignition

Yes you are correct. The Vortec's will keep the velocity up in the port which helps torque. The Vortec's also have a better combustion chamber design so they are more efficient.

what about the S/R torquers? they have 170cc runners and the pre 87 come with 67cc chambers. i called WP and they told me u can machine the 2 inner intake bolts and the rest is a direct bolt up. also have 2.02 1.60 valves....