Hello to all! Looking at building a hot 289 for light duty racing, and long-term Carrera Panamericana ambitions. With that in mind I'm limited to stock displacement and stroke, iron heads, and 600cfm 4bbl max. Oh, and to top it off, race requires you to run 87-91 octane pump gas. With all that being said, the best bet seems to be building a sort of "modern" HiPo 289. I'm not looking for peak HP, but more so a durable little block that pulls strong to redline, say 6000-6500rpm max. Looking for input on heads/camshaft, with build specs as follows: 289 stock crank and rods Late Model 302 Block OEM hydraulic lifters Hi-Rise Dual Plane Aluminum Intake Tri-Y headers (to fit 1962 Meteor) 2800-3000lb race weight Toploader/Super T-10 3.55-3.73 Rear Gears I'm leaning towards bonestock, GT40 iron heads (1.84/1.54 valves), with some seat and bowl work. Coupled with a custom ground cam from Ed Curtis. Any suggestions or wisdom regarding camshaft duration, compression (static/dynamic), and head selection are all appreciated!