340 buildup advice

I build a lot of customer's muscle cars with the 700R4. I did not know there was a 2004R conversion for the LA. Who sells the adaptor plate? Is the crossmember just modified? I definately like the idea. The 200 is a great and strong tranny.

Wilcap and tci sell the adaptor (though you have to trim the tci adaptor to fit) and you jus have to mod the bolt in cross member.