You can buy the complete front rail assemblies on ebay all day long for about $120.00 and includes both rails and crossmember. MAKE SURE if you buy the rail assemblies off of ebay, to get one from a 90-91 and NOT 84-89 or 92 and up as they are different & you will have issues installing brackets and such due to bolt locations.
Best to ask around for someone that has parted a 90-91 L98 or LT5 as both years are the same.
http://cgi.ebay.com/ebaymotors/1984-...mZ290591282017
We have the rh frame engine mount brace in stock new for $89.99
http://www.whiteracingproducts.com/i...x&cPath=10_289