Will this work?

[6.0 1955]

That 212/218 cam will work good in a daily driver style truck. You can pick up that cam and some ls6 yellow springs. You don't have to change the lifters as they are roller lifters and in a 03 model it doesn't have dod. Truck intake should work well with that cam and will keep low end torque. The 243's are a great flowing head and for this setup
I wouldn't have them porter but would have them milled to
keep your compression ratio up. If memory serves
me right the 243's are 64cc and the 5.3 heads are around 60cc.
Hope this helps and you will really enjoy this setup
In a truck.
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