Help please! 250/454 swap

[Dan1972c10]

I am new to the site. I have a 1972 Chevy C10 step side with a 250 6cyl and Saginaw 3 speed. I am having a 454 rebuilt and it will be about 500hp. It will be overkill for cruising but it will not be raced. I have some questions.

1. I have no idea about the motor mounts or stands. Will my originals work? If not what will I need?
2. I have headers. Will they work or will I need stock exhaust manifolds?
3. I think I need a much larger radiator...3 core? What year and size truck would I search for when I am looking?
4. I have been told that the old three speed Saginaw will mate up and would be easiest, but will not last long if I get into the throttle at all. A friend gave me a rebuilt turbo 400 but it's out of a 4x4. Do I need this tranny and can it be adapted?
5. Coil springs... I assume that I need heavier duty springs. Correct? It's already really mushy. The added weight will not help. Which ones should I get?
6. This truck supposedly had a 4:30 rear end. Is this way too low for cruising around? I am sure it would tach high at 70 on the highway.
Thanks in advance for your help
Dan
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