A 4.3 would destroy a KM148 in short order.

I suggest you buy a running wrecked S10, and swap the entire drivetrain over.

Youve got a long list of adaptations to make.

Exhaust system, Fuel system, shifters for trans, and transfer case, throttle linkage, driveshafts, motor mounts, trans mount, efi wiring, dash/tach interfacing, starting system, charging system, power steering system, AC if youre going to use it, cooling system, trans cooler.... etc....

Lots of stuff to tackle.

87 Raider 4D56td v5MT1
31's..Basically Stock