"A two piece aluminum timing cover for 250-292. Easy cam change type."

Beater of the Pack, such thing already exists.

In Argentina and in Brasil folks do a lot of stuff for the 250 Chevy engine.

I might want to take a look at that:

http://www.josephcompeticion.com.ar/josephome.htm

or the 3 parts timing cover in Brasil's Limit Performance:

http://www.limitperformance.com.br/lim00061.htm

Some great manifolds here:

http://www.engineracing.com.br/pecasnacionais.html

There are loads of good people out there that still developing good stuff for our beloved L6. A terrific engine buider and friend of mine does alum bellhousings, but he said it's becoming really hard to run them because nobody wants to afford. Kind the same situation as Kirby's.

250 and 261