I suggest Cool Carb products. This guy makes carb spacers and carb heat shields. I bought the carb spacers and a heat shield for my 340 but I am not after the stock look. The carb spacers come in different thickness's. Real nice guy too.

http://www.coolcarb.com/order-products.html

7187251-CoolCarb2.jpg (106 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)