1989 Camaro fuel pump replacement, is it worth it?

We have an '89 Camaro RS (V-8, 5.7) with only 70,000 miles. A leaky fuel line has turned into replacement of the fuel lines, brake lines and now a fuel pump. Our mechanic has only replaced the fuel lines so far but the brake line was rotted with the fuel lines and he's not sure if the lines will hold at the wheel cylinders. The fuel pump replacement could lead to dropping the whole exhaust and rear end and he really thinks we could be throwing good $$ after bad. What do you think? He says we're looking at a minimum $1000 repair bill.