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Well, I can't bash the Jeep engine I have, it runs strong at 150k. Ford... had 2 die with 131k and 129k, which is abysmally low, and had a Nissan blow a head gasket at 160k (my dad drove it a bit too much with a busted water pump - he didn't know, I replaced it, but the head gasket went about 2 weeks later... was easy to fix though).
You sure you arent mistaking the "springs" that hold the subframe and keep it from swaying with these "coil springs"? Although looking at what you did with your other 108, you probably would know (I'd hope) - as Peter said, other than spring strength, all 108's have the same front suspension (FYI: All 108, 109, 111 and 112 chassis are quite similar up front). I would look to see if someone actually replaced the front subframe suspension with some half-assed "custom" design which would be out of our area for help (if it does, in fact, have front leaf springs, then that's a HUGE problem - leaf springs were discontinued in the fronts LONG ago because the engine weight would cause RAPID sagging).
If it DOES have the coils still in there, I'm sure you can EASILY grab ones from a 4.5 which will DEFINETLY help with the sag AND ride quality. I bet SOMEONE here has a spare set (I saw a member with a sig that says he has a 108 4.5 parts car and 6-cyl drivers, so those 4.5 springs would be useless to him). If not, someone here can easily grab you a pair on their next junkyard trip, you can call tristar pete, etc etc!
This is actually the BG pic of that page with the subframe mount directions - I changed the colors to make it a little easier to read, and circled the subframe, pointed to the sub mount, and show where the spring and shock SHOULD be in the front hub assembly.
edit: forgot pic (silly me), and wanted to say: If it isn't stock (exactly like this picture) then post a pic or 2 (or more) of the custom "chop" job... I bet they had to cut the subframe (if not remove it altogether) to accomidate the chevy engine, which will really muck up your handling and make it... well, NOT handle like the road king it is!
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