Comp cams xe268h for 318

I have the 318 with stock 904 (999 lockup), stock torque converter, stock 2.76:1 ratio rear, and the Comp K20-212-2 kit (268/268). It putters around "ok" and theoretical top speed at redline is like 170 mph (stock 15" tires). I kind of doubt it would actually run that fast, and there's not a chance I would try it anyway, but it cruises at 70 mph at 2,000 rpm. Green light acceleration is pretty bad. Sounds menacing at idle. Mileage is still the pits, idling creates smell of gasoline, I suspect the large overlap (plugs all read good).
Like, before the cam the compression was 150 psi all-around, but after the cam, compression only hits about 110 psi: overlap. Idles at about 8” mercury vacuum.
Stock heads, I feel like I should possibly upgrade those. RPM aluminum intake, headers. I agree with the sentiment to update the rear end, one of the latest Roadkill garage segments they put together a brand new Ford 9" underneath a Dodge & looked like a pretty nice deal for roughly $2,500. I'm not a hot rodder, I don't drag race at all, so in my particular case the stock converter works just fine (if I ever use the power it's strictly rolling into some revs). If I was doing it again I'd choose a less radical cam, but now that I've got it - I'm not swapping it back out! I'm not displeased :)