340 camshaft

enigma57 said

Voodoo Hydraulic Flat Tappet Cam & Lifter Kit - Chrysler 273-360 262/268

This cam (see link below) is the next step up, but your engine will be on the ragged edge of being overcammed and I can guarantee you that running low gears and a high stall converter on the street with no overdrive and no lockup converter for highway use gets old real quick. Not to mention loss of drivability and sucking copious amounts of gas but not going any faster. Been there, done that.

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Great suggestion, and wise advice (learned the hard way - like most of us...)
Two additional suggestions
CC the heads while its apart. There's no reason to guess what the compression will be. I will never have an engine together again without knowing the actual head CC and piston above or below deck.
Stock heads aren't going to flow significantly more with the valves over .5" open.

I've used the street dominator intake and found it pretty decent single plane at lower rpms. It had a better rep than the Torker but I've not run them back to back. If you want to stay with single plane, I would try both. The Eddy RPM with a Holley 4150/60 will bring the air cleaner close to the hood. Check and double check clearance of stud and lid with clay or aluminum foil. A mild drop base will likely be needed.