72,91,92,96,99 Cadillac C-10 Pickup truck

[Pyrotechnic]

This swap doesn't make a lot of sense to me.

From Wikipedia

A larger version of the 4.5, the L26 4.9, debuted in 1991 at 4.9 L with a square 92 mm (3.6 in) bore and stroke. Despite the fact that it had similar output to Allante's 4.5 L port fuel injected V8, the 4.9 L engine represented a significant upgrade for the remainder of the Cadillac lineup. Horsepower output was up 20 hp (15 kW) from the previous 1990 4.5 L engine and torque was up by 30 lb·ft (41 N·m), to 200 hp (149 kW) and 275 lb·ft (373 N·m). Both the 4.9 and 4.5 port fuel injected engines required premium fuel due to a 9.5:1 compression ratio. The 4.9 produces its maximum horsepower at 4100 rpm.

200HP and 275TQ

I hate to break this to you, but you are going to spend a lot of money on a motor swap that doesn't perform all that well and may not be very reliable, let alone easy to get parts for.

There are a lot of other motor swap options that make a lot more sense. A 5.3L or 6.0L LS motor for example. If you gotta have Cadillac, get a 472 or 500. Any Pontiac, Olds, or Buick V8. Even a Ford 302 makes more sense!

Bottom line, sell the car intact and get what you can for it to fund a different motor swap. Don't get me wrong, I love unique and out of the box engine swaps, but they have to make sense as far as money/time/power. This one is going to expensive, time consuming, and low on power. Not trying to bash or anything, I'd just hate to see you invest a bunch of time and money into something and not be happy with the end result.

A cherry Cadillac like that could pull some decent cash. With the whole "donk" look being popular right now I'm sure there is someone who would pay you a pretty good amount for that car.