3 speed saginaw in 72 gmc with 350

[SnS C10]

I have a 72 gmc half ton im pickimg up friday. Has a 350 with hooker long tubes, 2.5 inch pypes stainless exhaust, dual flowmaster 40 series, edelbrock 650 carb with performer intake and a stock cam. Never driven the three speed saginaw. I like to drive fast and shift hard occasionally, how will this trans feel and hold up? What is the top cruising speed? plan is to covert it to floor shift as well
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