What role is the M-20/LAV75/etc supposed to have? How the vehicle is intended to be used (pre nukes, not post) is going to have a great impact on armour protection, speed, etc.
For example, a scout vehicle is likely to be lightly armed and armoured, fast moving and probably amphibious. If the M-20 was intended for light units (airborne, leg mobile, etc) to have some basic armoured support, then speed isn't likely to be of high importance.
I like Targan's idea of using the 6V-92TA 6 cylinder Detroit Diesel or perhaps the 8V-92TA 8 cylinder Detroit Diesel. Makes sense to use something already in production (would certainly help the supply chain), but availability could be a problem with these other vehicles also needing them.
Obviously size of the engine bay as Paul mentions is a limiting factor also unless we're looking at rebuilding the hull as well (not something likely to be done after the nukes).
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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