64-65 Hemi swap? Anyone do it with the stock K-Member?

I would look at Tincup's build pretty closely to see what he had to do to fit the motor. Pretty sure he notched the inner fender to be able to get the valve cover off and the frame rail to fit the exhaust.

Don't think there are any manufacturers for headers to put a 5.7 in an early A-Body.

If you use a car timing cover, almost certain you will have to notch the frame rail for the alternator. I know the later cars sometimes get away without it, while other's need a small one. Being that your frame rails are like 2.5" closer together, I bet you need a good sized one. But a truck cover with the alternator up top would solve this (I think). Might be info in Tincup's thread about this, too.

I'm unsure if the steering box moved out when they widened the rails, but if it didn't then the box should be in the same spot. But I know the column is angled on the later cars, so it will probably be even closer to the cylinder head than in the later cars. My gut says the box is closer to the motor and will be an issue with a 5.7, but I'm just guessing.

Selling your blower manifold with the 5.9?