5.3 into a square -- questions

[kipps]

Truck is a 1987 v20 pickup, used for general farm errands and personal transportation, and likely a 12k cattle trailer in the future.

Truck tbi engine is rather tired, has never ran well, and is having numerous wiring issues. Faced with learning the entire tbi system, rewiring it, and likely replacing the engine, I think I'd better start with a better engine.

Donor is a 2010 tahoe that was rolled a couple weeks ago, and is available in its entirety for scrap price.

Engine will be attached to existing sm465 manual transmission, using a 6.0 flywheel and stock clutch. Already have a new stock radiator in the truck, so will use that.

Can I install the 2010 fuel pump into the 87 tank?

Is there a practical option for a engine driven fan, or should I plan on electric fans?

Can the old-school clamped fuel hoses handle the fuel pressures required?

Will I in any way regret using a stock 5.3 over a fully rebuilt 350 tbi?