Hi Lucas, welcome to the club!
The insurance price sounds relatively ok, a tad high perhaps (even for a more powerful V8 that would be a bit high). A friend recently insured a '96 Chevy Suburban with a V8 for about £145 with footman James. There's an insurance sticky in the General section that lists the main suppliers (thanks Stu). You could compare quotes with Footman James and RH
http://www.rhclassicinsurance.co.uk/cla ... rance.html
For parts, i've found some 4th gens on ebay being broken, have a quick search on there and you should get one or two private sellers / salvage places come up.
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