Performer RPM Cylinder Heads For S/B Chrysler

Hello from a fellow Canuck

273s are a tuff performance build. Are you married to it?

If I was, I think I'd stuff a 3.58 stroke in her to make a 300cuber. That crank will raise your pistons .1325, so you might need custom pistons. In this way, you can make almost any compression ratio you want with any head you choose, just by dictating the design of the piston crown. No decking, no shaving, no intake machining. and everything fits like stock.
To run a 268* cam with this combo, it will like 10/1 compression, and that will mean a total chamber volume of 68.3cc. This should be fairly easy to achieve. 6.4 in an .028 gasket, 5cc in the eyebrows and so 57 in the heads, all with a zero-deck.
But you may not have any eyebrows left, so then the head can be 62cc.
With an .028 gasket , you're gonna have to lower the piston a bit, say to a deck of -.011, and that would add 1.87cc, and so the head could now be 63.9. You see how easy this is?
I would use magnum heads with 1.92 valves, and notch the bores, no big deal.
So to recap, the 360 small-main crank, and custom pistons and you can generate quite a bit more torque and power, yet get better fuel mileage than a hot teener.
It may be possible to use 2 bbl pistons, but I think they'll be a bit far down,still. I heard they're often down .157, so after the crank boots them up .133, the pistons are still .024 down and that won't work with a .028 gasket; not enough Squish. This combo will like squish of .035 to .045, so the max down would be .017.
But if your decks need cleaning up, well then you're back in the game.
Keep in mind that this is just a hypothetical build. If you were to go this way, you'll probably have to balance the crank, and check the piston to valve clearance etc.
In the end...........you're gonna spend more money than necessary, in terms of performance.
Just throwing out ideas