Engine health checking help for a sunday purchase

Im taking a trip to check out this engine and transmission. All the owner knows is that the previous owner ran it in his challenger, said it had a performance cam and was set up for racing but then he swapped to a 440. The transmission is a Fairbanks performance 727. I have no idea what those torque converters are or which I should grab.

Any help or advice would be greatly appreciated!

For context im swapping out my slant 6/904 combo for this. Its a big job but im going to take my time.

Separately any advice on transmission linkage or crossmember changes that are needed? I already ordered the schumaker engine mounts.

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