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Would headers increase my Hp and by how much?

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If you cant find it grind it

79 4x4 1.8 liter
75 K 10 Lifted with 383 stroker
69 Jeepster comando v6

Headers would be part of a whole "flow" system, and while they might help at the top end, you might lose torque at the bottom.

Normally, if you increase the ability of the engine to move air, then you would need to open up the exaust to let it flow out that end, but by itself, the gain is minimal.

On other engines I'm familiar with, the upgrades are as follows:
low restriction air filter: 5 Hp
low restriction Muffler: 5-10 Hp
header: 5 Hp
all together 20-30 HP (at the top end)

Now, if you alter the intake, add cams into the mix, port & polish the head, etc. then you can get another 20-30 HP, and by fiddling with cams and cam timing adjust where the torque and power are made to some degree. Power cost money. How much do you want to spend?

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1978 shortbed fleetside, th350, Fireball 231 Even Fire V6, Edelbrock 500CFM Performer with Edelbrock intake. Workin' Truck.

How much low end torque you might lose depends on the header. Length of the tubes has a big effect on that. A typical 4 into 1 header gives you more high end HP, but had more effect on low end. A tri-y like Calmini sells for Isuzu moters tends not to drop your low end. The Calmini for Isuzu 2.3L motors could be used on a LUV, though the ports are not quite right (round on the 2.3 vs squarish on the LUV motor). Check them out at http://www.pureisuzu.com if you are interested.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good