Eastwoods also used to carry a replacement for lead filler. It included fiberglas. We used it on the Suburban body-seams and have no problems after 10 years.

I think these are different products:
http://www.eastwood.com/metal-to-metal-filler-quart-with-hardner.html
http://www.eastwood.com/sem-carbo-fill-plus-27oz-40542.html

They also sell a lead-free solder kit.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.