I think a new windshield in my '68 Dodge truck was around $100. They guys doing he install said, come see the difference. The old glass was thicker and much heavier. The new glass was a great brand, Pilkington ... you know, the guys that invented modern float glass. If you've got a great old piece of glass I would likely use it. But, the problem with old glass is that it simply gets more and more brittle over time. With the older glass it kind of is a crap shoot.