Jeep 4.0 in 69 Barracuda

Ok, looking at what it would take to cut the firewall to set the engine back.

The head is just under 7in wide. Given the engine rotation during hard acceleration, I should probably give myself 8.5 inch opening, with most the space favoring the way the engine would rotate.

If you look at the firewall, you will see that proud spot just to the left of the heater core outlets. The passenger side of my head lines up with that.

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The driver side of Engine almost lines up with the lower bolt on the wiper motor.
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Most interesting is the intake manifold. I already have 2.5 inches off the firewall. I could cut that little end piece an the rear of the manifold and have more than enough clearance.
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I have never done anything like this before. I dont know if I would even trust my welding for anything other than initial tach.

Can anyone speak to how the heater core fits in the mid section of the firewall?