front end woes

i have a 72 duster that i drag race. my problem is every time i leave the
tires toe in like 4". i have had it in the front end shop twice and still does the
same. i found one of the problems it had b body upper control arms on it
when i bought it and i didn't know it. it made it better but it still isn't right
and the severe toe in is killing my 60'.
any suggestions would be greatly appreciated
mike