273 Conversion Questions?

The Isky E-4 is the closest I came up with also. Solid cams pull and rev faster than hydraulics. I would keep your solid set up if you can. Replace the valvesprings also to get the most out of your cam. Toolman and I have posted sound clips of a running E-4 273. If you are running pump gas I'd use readily available flat top 2 barrel pistons. Also get a quick curve distributor. Nothing runs as good as an original 273 AFB on one of these engines in relatively stock configuration...