I did a LT1 swap into a 1966 Impalla with awesome results. That's why I'm now deep into the middle of an LQ9 into my '72 K5 Blazer.
The thing with tanks made for in-tank pumps is a couple of things.
They have baffles in them so as to "trap" some fuel close to the fuel pick-up so in turns and when you have low fuel quantity, you don't get the pump cavitating ( trying to pump air....which you can't....it gets compressed until fluid is pumped again....bad joo-joo)
The second thing is that it's already plumbed for the return and the vent.
Other than that, if you have to you can always regulate the pressure to the/at the fuel rails to your need if you use another set-up ( even with an noisy external pump ).
So do some web searching and you'll get the idea clearly.
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