Now, Julian has done very nice work, and I trust him with the fat man fabrications and his advise. I personally have a car like yours that I have hot rodded... I have done a nice front subframe set up for it (using 79-81 olds / malibu as a donor vehicle) with pictures if you're interested.
As for fiberglass fenders... I do not know of a source for oldsmobile fiberglass fenders, but for the right price, I'm sure that I could get them made for you.
If i can be of assistance, or if you would like to see photos... drop a line at
jjferrero3@yahoo.com
good luck
~Joe