I used a sealed LED rear turn signal lens with tons of led's in it (45). Looks just like the stock lens for only about $30 per side, including the housing and license plate light. That is what repro lenses and housings cost with regular bulbs!
http://www.speedwaymotors.com/xq/aspx/dept_id.433/display_id.4051/qx/Product.htm

Speedway also has the LED flasher for $10.
http://www.speedwaymotors.com/xq/aspx/paging.yes/dept_id.433/display_id.4372/qx/Product.htm

The other day at LOVE's Truck Stop and Travel America Truck Stop I was looking for a cellphone antennae and saw LED bulbs to fit many different regular sockets and LED flashers for $10.

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi