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* 'Mandatory' 9 year old topic update! *
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Major topic-revival from the almost forgotten basement.

9 years since this topic started.
Plenty of new stuff has come out since then so it should be easier to get to '500hp' nowadays.

To kick it off again;
I'm considering to wake up my current stock stroke and dailydriven 360ci engine in a '73 Dart a bit more.

This engine has a 11.3:1cr, polished '302' heads with 60/61cc chambers.
KB-pistons, balanced assembly. AirGap intake.
(Hydr.) CompCams XE256H, used with solid lifters and Crane 1.5 rockers.
208-210 cranking compression. Running on Propane fuel.
Doug's full length headers into a dual 2.5" exhaust system with X-pipe and Borla mufflers.

Would like to keep the shortblock/crank ass. as is (zero-deck), and considering going to a solid roller and some SideWinder heads perhaps.

Won't mind a little lopey idle, and I know this is contradictory, but fuel economy is a consideration so low/mid range torque/efficiency is King.
Like to keep it N/A.

What are today's options of getting at (around) '500hp' while keeping the engine docile enough for daily use and not be a handful to drive?