Growing up and hunting in the woods of Northeast Mississippi the 740/742/760 in 30-06 were probably the most common rifles you would see at deer camp, Weaver "Flip Scopes" were popular too.
This is a page I've shared before with good information on a lot things including Remington firearms. The dimensions for the Williams accuracy block are there also, looks pretty easy to fabricate.
https://www.leeroysramblings.com/Gun%20Articles/remington_7407427400_semiauto.html
