Well you stated it's bone stock, if thats the case, you have E7 heads.
A stock 5.0 H.o. cam which i would keep btw, this cam is a great economical cam, and will build 300 hp with some better heads, and lots of torque. the e7's are a somewhat small valve head, but if ported, can make decent street/strip power.
On the price they quoted, it really does'nt sound that bad if they do good work, and will have your block freshened with some cam bearings ect.. but....
Id blow 1500$ for a brand new stock explorer shortblock, put the 5.0 cam in it, (since the explorer cam is probaly to torquey), and then blow the rest of the cash on a set of afr 165 cylinder heads, you would have a solid 300 hp with a smoothe idle, torque would be through the roof! and throw a cheap explorer or cobra intake on, and you still might have some left after you sell the 88 5.0 longblock with no valve covers
But thats just me
