My 87 Wrangler has an AMC 360. Yes, it's carbureted, gets horrible gas mileage, and needs tuning. There are FI kits for this motor.
The swap was soooo easy. Almost everything is plug-n-play. The major exception is mounts. You have to purchase or fabricate and weld in place of the existing ones. But: The transmission bolts up. The alternator plugs in. The power steering swaps over. The firewall mounted parts clear the engine. The steering shaft clears. The ignition plugs in. Fuel lines are in the right place. Power is very, very adequate after a rebuild with better cam and porting, etc. The radiator probably should be replaced with something with more cooling capacity. It is very possible to run into the infamous AMC distributor/oil pump drive gear gremlin.
Is it old tech? Absolutely. But so is an 87 Wrangler. And so am I.