Keeping it AMC, I was wondering about an AMC 2.5 like from an older Wrangler. Power will be comparable to what you had in that 199.
No idea what it would do to your mileage though. The 2.5 was better for torque than power, pushing something like your Rambler instead of the phone booth that is the Wrangler, it might do okay.
You'd have enough room in front of the engine to hide a lot of stuff. Convert to electric fan and there'd be even more.
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Lead or follow. Either is fine.
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