I have a 1942 Win M70 that has a messed up safety
on the bolt. Are there any replacements that
will have the drop down safety lever like the
current M70's, or at least one that will easily
clear a scope? I am assuming that the current
production bolt shroud and safety won't work - am
I wrong?

www.wisnersinc.com/rifles/winchester/70pre.html

Wisner's has what you need, Tilden style safety and sear pin.